Database Info

Sandisk 64GB failure

Just curious, as I am about to be on my 3rd card. First two cards, transfered for a short period of time, then froze, then reformatted, same thing. Next time reformatting froze, and both cards showed unsupported file structure.
Used:
Dban
sdformatter
diskpart
gparted
linux fedora built in formatter
os x disk utility
fdisk
and everytime the card fails to format. I did call sandisk who told me their class 10 64gb microsd cards have had a really high fail rate...
I was on the phone with them asking why I should keep the card...lol
i am not angry, just really curious if I am the only one. Would be my Irish luck!

Have you tried this
https://www.dropbox.com/s/660o0s5rf68az3q/guiformat.exe

droidstyle said:
Have you tried this
https://www.dropbox.com/s/660o0s5rf68az3q/guiformat.exe
Click to expand...
Click to collapse
failed aswell on both cards :/

nosympathy said:
Just curious, as I am about to be on my 3rd card. First two cards, transfered for a short period of time, then froze, then reformatted, same thing. Next time reformatting froze, and both cards showed unsupported file structure.
Used:
Dban
sdformatter
diskpart
gparted
linux fedora built in formatter
os x disk utility
fdisk
and everytime the card fails to format. I did call sandisk who told me their class 10 64gb microsd cards have had a really high fail rate...
I was on the phone with them asking why I should keep the card...lol
i am not angry, just really curious if I am the only one. Would be my Irish luck!
Click to expand...
Click to collapse
I've had my SanDisk 64 Gb card and GSIII for a whopping 8 days.
No problems yet, I filled up 50 gigs on the card and no errors of freeze ups (I haven't transferred anything into the card since the day I got it)
I'll let you know if it kicks out on me.

SeattleParis said:
I've had my SanDisk 64 Gb card and GSIII for a whopping 8 days.
No problems yet, I filled up 50 gigs on the card and no errors of freeze ups (I haven't transferred anything into the card since the day I got it)
I'll let you know if it kicks out on me.
Click to expand...
Click to collapse
mine was immediate. First card I got 12 of 24gb transfered crashed, second card was 6gb of 24 before it crashed.
they are overnighting me a 3rd card, so i prolly will get it thursday, and will try again...

I purchased the 64Gb Class 6 over a month ago and have had no problems. I was bummed I did not go with the class 10, now hearing the high failure rate on the class 10 makes me glad I got the class 6.

Thats wierd, mine has worked flawless so far. Keeping my fingers crossed lol.

Is this the microSDHC or microSDXC? I'm about to pull the trigger on this one and if it's the same model, I'll wait.

Aquila76 said:
Is this the microSDHC or microSDXC? I'm about to pull the trigger on this one and if it's the same model, I'll wait.
Click to expand...
Click to collapse
Mine is the sdxc-1

Aquila76 said:
Is this the microSDHC or microSDXC? I'm about to pull the trigger on this one and if it's the same model, I'll wait.
Click to expand...
Click to collapse
SDXC
droidstyle said:
Mine is the sdxc-1
Click to expand...
Click to collapse
yes this one.

Sorry to hear about your issue. I guess I'm glad that I cheaped out and went with the Class 6 before they started giving the good deals on the Class 10 ones.

open1your1eyes0 said:
Sorry to hear about your issue. I guess I'm glad that I cheaped out and went with the Class 6 before they started giving the good deals on the Class 10 ones.
Click to expand...
Click to collapse
I didn't think there was even a class 6 for sandisk's 64gb SDXC? One doesn't exist on their website anyways. I had even bought one off bestbuy advertised as the class 6 version, but when it showed up it was the class 10(possibly UHC too, threw the package out so I'm not 100% sure on that part)

Brian Gove said:
I didn't think there was even a class 6 for sandisk's 64gb SDXC? One doesn't exist on their website anyways. I had even bought one off bestbuy advertised as the class 6 version, but when it showed up it was the class 10(possibly UHC too, threw the package out so I'm not 100% sure on that part)
Click to expand...
Click to collapse
My mistake, you are right. I actually meant between the two versions of the 64GB, the cheaper (non-UHS?) one.

I had a Class 10 64GB Sandisk card fail on me but it was plugged in to the computer via USB at the time so I don't blame it on the Galaxy S3. They sent me a Class 6 card in return. When pressed on it they said they have been having problems with the Class 10 cards and their technicians are looking in to it. After dealing with Sandisk customer service for a week, they finally agreed to send me a Class 10 card after I send back the Class 6 one.
So that means I'll be without an external sdcard for another 3 weeks! Total time I have been dealing with this issue is 4 weeks so far.

The Galaxy S III format function will only format for extfat32 which is Microsoft proprietary and not fully understood by Samsung or others. Its a known issue now that it causes corruption and missing files on the Galaxy S III. ROMs will also not support the formatting, you need to format Fat32 using a tool. I'm not sure if it could lead to permanent damage though as described in OP.
http://forum.xda-developers.com/showthread.php?t=1803814

Been running Class 10 a couple months. No problems so far. Formatted fat32.

manaox2 said:
The Galaxy S III format function will only format for extfat32 which is Microsoft proprietary and not fully understood by Samsung or others. Its a known issue now that it causes corruption and missing files on the Galaxy S III. ROMs will also not support the formatting, you need to format Fat32 using a tool. I'm not sure if it could lead to permanent damage though as described in OP.
http://forum.xda-developers.com/showthread.php?t=1803814
Click to expand...
Click to collapse
there are plenty of people using the card in exfat, as many have stated they stuck the card right in the SIII and off they went.
also, plugging the card right into my computer, and never into my phone, led to the same issue.
also mentioned, calling sandisk, they said their is a high failure rate on the class 10 cards. Those of you with cards still working, I hope my new card coming in tomorrow, works the same way.

nosympathy said:
there are plenty of people using the card in exfat, as many have stated they stuck the card right in the SIII and off they went.
also, plugging the card right into my computer, and never into my phone, led to the same issue.
also mentioned, calling sandisk, they said their is a high failure rate on the class 10 cards. Those of you with cards still working, I hope my new card coming in tomorrow, works the same way.
Click to expand...
Click to collapse
If you do still want to get your old one working (if you still have it), I guess you can try this utility. It worked for me when I messed up some of my old cards pretty badly. Perhaps it is worth a shot?

yosterwp said:
If you do still want to get your old one working (if you still have it), I guess you can try this utility. It worked for me when I messed up some of my old cards pretty badly. Perhaps it is worth a shot?
Click to expand...
Click to collapse
have that listed in my OP, didn't work on either card. If I ran it on the card normally, would tell me the card was write protected. If I ran it on the card after using gparted to delete the main partition it would get about 40% through formatting and then fail saying the card stopped reading.

Sandisk cards really are junk & it's not just the 64 gig class 10.
I have used their cards for years as there is not a lot of other options at times, but I had three of their 32 gig cards go bad on me.
I now have three 64 gig class 10's but I back them up religiously to my PC. I don't use FAT32 as I store blue-ray rips to my card that are over 4 gigs & FAT32 won't allow that.

Your SD card likely isn't the problem

I was going to post this in response to a couple of people in the development sections but my post count is too low so I'll post it here instead.
The SD slot in this phone seems to have an issue with corrupting SD cards, I've had to format both my old and new SD card multiple times with this phone as it becomes unusable every few days. I'm not versed enough in hardware to know if this is a bad connection between the SD slot and the "motherboard" of the phone. I've seen a number of people have their SD cards go bad with this phone and I assume that means we had a manufacturing issue. It would be really cool if a hardware hacker experiencing this issue could take a look inside and confirm whether or not the hardware is connected correctly.

Well, perhaps there's a high number of bad readers....
I've had the same card in my Q since the day I got it (mid-September), no issues.

Mine wouldn't read the day I swapped up from My Epic 4g Touch to This phone, So I popped in an sd reader backed up my data then let the Moto format it, no issues sence

Curious to know what class of card you guys are running. I've been running a Patriot class 10 but my previous was a class 4 without branding that came with my old Transform.
I'm really hoping that I just had my old SD card die at a bad time and that my newer SD card was just sent bad. Today I couldn't get the card to read from the SD slot in my computer, and it would not be cool if my phone caused it to become that way.

Solust said:
Curious to know what class of card you guys are running. I've been running a Patriot class 10 but my previous was a class 4 without branding that came with my old Transform.
I'm really hoping that I just had my old SD card die at a bad time and that my newer SD card was just sent bad. Today I couldn't get the card to read from the SD slot in my computer, and it would not be cool if my phone caused it to become that way.
Click to expand...
Click to collapse
Class 10 Maxell
http://www.tigerdirect.com/applications/SearchTools/item-details.asp?EdpNo=2074251
No issues here. I tossed the crappy class 2/4 that shipped with my Epic long ago.

Well I found an extra class 4, 2 GB SD card lying around the house when I was cleaning today. It may be that the local shipment of phones was bad, so if this SD card goes on me then I'll try exchanging the phone in another town just to be safe.
Just out of curiosity does anyone know whether Sprint orders enough phones for replacements with their original shipments? I'm not from a very large town so I'd imagine they would keep replacing with phones from the same batch.

I've got a Samsung 32GB class 10 mSD.
Nearly everytime I reboot my Photon Q it says "SD Card is damaged".
Go into settings, Mount SD Card once or twice and it works.
I've read, that other Android Devices have also problems with that size of SD Cards. (Google)
I had also problem in recovery restoring a backup, the restore process didn't went correctly
(said that everything was fine), had to use my 2GB mSD, which worked nicely and the backup also.
So I think it's an android/kernel issue than a hardware issue.

I have noticed that I get the corrupt sdcard error everytime I try to use the "mass storage" or "media device" setting with Windows.
I use Ubuntu 99% of the time and leave it connected in "camera" mode, have never had that pop up like that...
I usually just use ADB to copy everything anyway so I do not miss the "mass storage" mode at all.

Just had a 16gb class 10 microcenter branded card go belly up on me. Phone just all of a sudden said it was removed and now nothing seems to recognize the thing. The mount option is completely greyed out, and does the same on my note 10.1 if i pop it in there.
When your cards have gone did they completely disappear and refuse to read?
Sent from my XT897 using xda app-developers app

I wonder if it's the c10 cards...
You guys really shouldn't be using high class cards in a phone - there's really no benefit, as phones use SD card's very differently from camcorders or cameras...
On my ooooold phone, anything above Class6 was bad juju. I have always had class4 or lower cards, no fried cards (yet... lol)

kinda what I am feeling too. Not sure what class card I have but it was just a cheap 32gb from wallmart... Only had that error pop up once with this one though, and that was after trying to use usb storage.
Sent from my XT897 using xda premium

arrrghhh said:
I wonder if it's the c10 cards...
You guys really shouldn't be using high class cards in a phone - there's really no benefit, as phones use SD card's very differently from camcorders or cameras...
On my ooooold phone, anything above Class6 was bad juju. I have always had class4 or lower cards, no fried cards (yet... lol)
Click to expand...
Click to collapse
Class 10 shouldn't make a difference to a device. The class/speed only comes in to play when transferring data from/to a computer, which will be faster on Class 10 vs Class 4 or 6.
Sent from my PC36100 using Tapatalk 2

arrrghhh said:
I wonder if it's the c10 cards...
Click to expand...
Click to collapse
As best as I can tell, thats a negative. Ive been running with a 32GB class 10 since around when the phone was released, and Ive had no issues. Quite surprising on its own, seeing as I abuse the poor thing. True that class 10 arnt useful for the phone specifically, but some shops only carry class 10 cards.
@hfase
I dont seem to have any issues with mass storage, with ~1GB written a day. Im quite curious as to why some people have this issue.

ADegtyarev said:
As best as I can tell, thats a negative. Ive been running with a 32GB class 10 since around when the phone was released, and Ive had no issues. Quite surprising on its own, seeing as I abuse the poor thing. True that class 10 arnt useful for the phone specifically, but some shops only carry class 10 cards.
@hfase
I dont seem to have any issues with mass storage, with ~1GB written a day. Im quite curious as to why some people have this issue.
Click to expand...
Click to collapse
Maybe it's all down to the quality of the actual card itself?
Perhaps the cheaper no-name / off-name brands have a much higher failure rate....?
I'm not really sure, short of actual hardware issues on the device.

AW: Your SD card likely isn't the problem
Well here is my experience:
I am using a new san disk 32GB class10 micro sdcard. It was never format ed/ used before. The q itself formated the disk.
I have had no problems until using the twisted asanti prebuild
Version. Since then I only got problems with the qu saying the sdcard would be corrupt, after reboot. ( I expected some additional wired things, like the currents widget, which I deleted before reboot reappeared). So I would suggest it is an error in un mounting the sdcard before shutdown, which causes this failure.
Since I usually do not reboot the phone expect for flashing new roms, I had no trouble since then.
Hope this might help to further circle the problem, and maybe find a solution for this.
Sent from my awesome XT897

Since CM10 I haven't noticed any SD-Card issues, but I have the feeling, that there are some issues, which aren't detected.
In the last few days my CM10 was acting weird.
1. The gallery (together with the camera app, 2in1 app) disappeared in the App Drawer (was still in /system/app) and didn't appear again after overwriting gallery2.apk again.
2. The Google Weather App had a graphical issue, so I was sure, that there was a flash issue by restoring ASA14 and flashing CM10 (from SD-Card!).
I solved this issue in copying the nandroid backup and CM10 to the phone and flash it from there.
I have tested my SD-Card in my external cardreader, it had no issues in doing so.
My guess is, that the SD-Card needs more power than the Photon Q can give and is losing some read/write commands.

arrrghhh said:
Maybe it's all down to the quality of the actual card itself?
Perhaps the cheaper no-name / off-name brands have a much higher failure rate....?
I'm not really sure, short of actual hardware issues on the device.
Click to expand...
Click to collapse
I think This may have hit the nail on the head. I have had a couple cheap discount cards die but they really died. Cant even read in the PC and one even got really hot when plugged in. Got a good branded card from amazon and havent had a problem since.

Mordannon said:
I think This may have hit the nail on the head. I have had a couple cheap discount cards die but they really died. Cant even read in the PC and one even got really hot when plugged in. Got a good branded card from amazon and havent had a problem since.
Click to expand...
Click to collapse
I've used better Samsung and Sandisk cards and have had this issue. It just randomly wipes all my data and creates the LOST.DIR with it all in there, but file names are all renamed and would takes years to sort through and try to figure out what is what. All my photos, music, etc.. were basically gone then. It didn't matter that the card was a name-brand or not. I've had the issue with several cards.

I constantly have this problem as well, and I've found that mounting the SD card with a reader or in another phone in a Linux environment fixes it for the most part. I think files still get lost, but you get most of what you had back.

I got a 32GB UHS1 card last week and it hasn't had a problem.

Having a weeeeird SD card issue.

Alright so I recently bought a 32gb sd card so I could put the rest of my music on my phone. And I transfered all my music on to it. Put it in my phone. And all of the sudden half of it is deleted? So I thought I was crazy and put it back in my laptop and sure enough half of it wasn't there. So I transferred the music again by selecting all the music instead of just moving the folder.. Waited till it was done. Checked to make sure it was all there and put it back in my phone.. Sure enough half of it has been deleted again. I'm on Embryo 6.5, I use player pro as my music player, and the card is a SanDisk 32gb.
Sent from my SAMSUNG-SGH-I727 using Tapatalk 2

Sounds like you're either trying to move too much at one time, or you have a bad card. The ROM is really irrelevant as you have been putting the SD directly into the computer.
Sent from my SAMSUNG-SGH-I727 using Tapatalk 2

I've moved a lot more to different storage devices and never had a problem. Like I said, it disappears when I put the card into the phone. I did it again and threw it in my tablet this time, and it all showed. It's definitely a phone issue. The card is fine.
Sent from my SAMSUNG-SGH-I727 using Tapatalk 2

Sounds like it's not rebuilding the database. Are you trying to read it with the player or with a file explorer?

hechoen said:
Sounds like it's not rebuilding the database. Are you trying to read it with the player or with a file explorer?
Click to expand...
Click to collapse
Both. The music files are gone. It shows them gone when I put it back into my laptop also. As soon as the card goes in the phone, it deletes them for some reason.
Sent from my SAMSUNG-SGH-I727 using Tapatalk 2

Bad SD card..

mahanddeem said:
Bad SD card..
Click to expand...
Click to collapse
Yep, sounds that way. There is a huge problem with counterfeit and sub-quality SD and Micro SD cards these days. It is so huge of a problem that many of the cards that are sold from Amazon, E-bay, and Brick-and-mortar stores are fakes. Its so hard to buy a legit SD card these days because the fake or altered cards are actually in OEM packaging or at least it looks very similar to OEM packaging. Many times defective cards or lower capacity / lower class cards are being physically altered to appear like more expensive cards. It seems to mostly be a problem with the class 10 cards. Sometimes people don't even know they are getting screwed because the cards usually work for the purpose that they use them for, but if checked (and some never do) the actually specs of the card fall way short. Many of these cards fail quickly as well. To add to the problem, certain phones "like" certain cards better than others. So one card may work well, and another card (same manufacturer, class, and capacity) doesn't work well at all. It's a crap shoot even if the card is good quality and legit. So, sometimes you just have to go through a few before you can get one that works well or just get lucky with buying one card that happens to work well. I purchased 2 cards that were counterfeit before I learned of the problem. Both were supposed to be 32 GB class 10 San disk cards and were marked as such. One was from Amazon and one was from Radio shack. I noticed a problem with both because while I was taking video in very fine mode, the phone would lock up when recording to SD card. Both fine and normal video modes worked and very fine video mode worked with no problem when saved to internal or when saved to another SD card I have (16 GB class 10 PNY). The problem was that both of the San disk cards were recording data at a rate that was too slow for very fine video and certainly way slower than a class 10 card. So, they were fake or altered to appear to be a better class card than they were. Just check Amazon reviews for most 32 GB class 10 cards (manufacturer doesn't matter) and you will see several benchmark reviews that show how bad these cards can be. Good luck, the best advice I can give is never trust an SD card with important info and ALWAYS back all data up...TWICE!

That's way when it comes to these things I always buy after I make sure I can return a defective item..

A bad sd card doesn't explain why it works fine in my tablet. Then music deletes when I throw it in my phone.
Sent from my SAMSUNG-SGH-I727 using Tapatalk 2

It was definitely Embryo. I switched to Rogers latest CM fix and everything is working fine now. All music is there, nothing is deleted randomly.
Sent from my SAMSUNG-SGH-I727 using Tapatalk 2

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Discussion of SDcards used on any device

Moving the intent of a few posts on LineageOS thread to here.
rb1979 said:
Hi everyone,
Some of you reported that SD Card stopped working. This happened to me too today after about 20 hours after the latest update. The case with me is it doesn't fix itself even after a restart. I'm kind of stuck, whatever I want to do with the SD Card it wants me format it. I always had it as internal storage with apps and other things there. I have the the backup from the before the update. Will that fix if I restore it? Just want to mention that I update every week and never missed one. I had very minor issues up until now. Week in and week out everything has been fine and I started using the rom with the first release, all clean, full format and then weekly over the air updates every single week.
If anybody know any solution please let me know, if nothing works or I don't hear anything I'll probably try the backup restoration. BTW, to be specific about SD card no working I always get two notifications, one is "Unsupported SanDisk SD card" and the other is "SanDisk SD card missing"
Thank you
Click to expand...
Click to collapse
KrisM22 said:
Use a card brand other than sandisk and size 32GB or less.
Click to expand...
Click to collapse
rb1979 said:
Thank you for you help, I really appreciate it. The problem I see, right or wrong, is that I had this card for a year with no issues, first under stock rom, then under CM, and now under LineageOS up until the latest update with no issues at all. So it's just hard for me to take the card as the problem. Especially after seeing other people reporting it too lately. Do you have more information than just that? Meaning LineageOS and won't ever get along with sandisk or size larger than 32GB because of some external hardware limitation or something like that. Or this is just general knowledge what works best with LineageOS? In the first case I can think about case I can go and invest into a new card but in the second case I can just wait it out until codebase improves. It would good to know more so I can make better decisions.
Thanks for your help again.
Click to expand...
Click to collapse
KrisM22 said:
In my experience, most folks presenting SDcard problems have sandisk. I personally have had problems with sandisk that has led me to avoid them. I prefer samsung. There are many others. edit currently using a pny U3 32GB, but it's an old one and only does 56/29MBs R/W.
Click to expand...
Click to collapse
adityak1303 said:
+1 @KrisM22. I agree that almost all the users that state that there's a problem with their SD card were using a SanDisk SD card including myself. @rb1979, if you really think that your card isn't faulty, then try using it in some other phone. If you face the same errors then your card is faulty. If it works fine on the other phone, only then can it be considered as a problem with the ROM.
Click to expand...
Click to collapse
rb1979 said:
Thanks both of you, I'll do some testing around and get back to you with my findings.
Click to expand...
Click to collapse
KrisM22 said:
I just ordered one of these because I want to test the 64GB thing as it keeps coming up.
Samsung 64GB 100MB/s (U3) MicroSDXC EVO Select Memory Card with Adapter (MB-ME64GA/AM) - $23 + some silly $3 thing to get free shipping over $25. There are faster ones out there but I'm a cheapskate and don't use it enough to justify it.
Click to expand...
Click to collapse
That's most of it - then it goes verbose and wobbly.
I welcome any and all comments about SDcards!
There is no OT here but remember the XDA rules and try to be nice to folks. You can learn without trying to control others' behaviour.
No need to pretend you are TD. (allusion to Alice in Wonderland - Top Doormouse)

Thanks for creating this thread. There are surprisingly few other recent threads that discuss this topic on XDA apart from the one I've previously linked to (https://forum.xda-developers.com/android/help/micro-sd-write-access-format-exfat-t3358275). Also, I'm bringing over the well informed SD related comments that you left behind.
---------------------------
I've got to push back on the apriori assumption that these are specifically Sandisk brand card issues without knowing the specific details of the issues and seeing actual logs, and also without knowing the history of the individual cards in question (details of every device it was connected to and how it was connected, what OS and what file management methods were used, and how full the card typically is, and how frequently it might be disconnected in the middle of a file operations, among other things).
We must be mindful of the fact that the majority of SD cards in circulation are Sandisk cards which means that the majority of reported problems will be on Sandisk cards but this does not mean that the Sandisk cards are experiencing proportionately more issues than other brands. I don't doubt individual experiences, but it they may not speak to a larger picture. For example: Having supported large systems (>300 devices) running Linux directly from SD cards I did not see more problems with Sandisk cards than others. We've not seen enough evidence here to declare that this this is a Sandisk problem.
rb1979 said:
...I had this card for a year with no issues, first under stock rom, then under CM, and now under LineageOS up until the latest update with no issues at all.So it's just hard for me to take the card as the problem
Click to expand...
Click to collapse
The fact that a card has been used for a long time under different circumstances does not support a logical argument that the problem is in the ROM, in fact that supports the logical argument that the problem is with the card.
adityak1303 said:
....if you really think that your card isn't faulty, then try using it in some other phone. If you face the same errors then your card is faulty. If it works fine on the other phone, only then can it be considered as a problem with the ROM.
Click to expand...
Click to collapse
Good advise since, if the cards is having problems it should bring the problems to the other devices. Testing a different card in the first device on which the problem was noticed is also a good test.
--------------------------
Here is some supplemental information specific to Sandisk SD cards' built in data protection on cards experiencing failure. https://forum.xda-developers.com/android/help/micro-sd-write-access-format-exfat-t3358275. To summarize what is there: An SD card may begin to fail unknown to us, and then when the built in data protection is invoked it "breaks" the card with a dirty bit at beginning of drive so it cannot be written to or formatted but still allows us to copy data. The symoptoms when that data protection is invoked are similar to those bing reported by people who can no longer mount the card in Android devices (Android devices require read and write access to mount the card, unlike when the card is access via card reader on computer).

Just an update. I tried to format the card as portable storage (after this failure as internal and being burned I have hard time trusting it now) but it fails. I didn't do any testing with other phones just went straight for format. I might just buy another card. I think the phone specs say it's 32 GB max, is it still the case with different OS or not (meaning it was due to software not hardware) if I could get something higher than 32 (the current broken one is 32) I would go for it.
Thanks

rb1979 said:
Just an update. I tried to format the card as portable storage (after this failure as internal and being burned I have hard time trusting it now) but it fails. I didn't do any testing with other phones just went straight for format. I might just buy another card. I think the phone specs say it's 32 GB max, is it still the case with different OS or not (meaning it was due to software not hardware) if I could get something higher than 32 (the current broken one is 32) I would go for it.
Thanks
Click to expand...
Click to collapse
I believe after you use it as internal, and then try to use it as external, you first have to write an MBR on it and a partition formatted FAT32. i use a bootable stand-alone GPARTED to do that.
http://gparted.org/
Moto says it's limit is 32GB. Folks have, I believe, used much bigger cards on it. Don't know what is the limiting factor - be it software (ROM) , hardware, or licensing (exfat for Microsoft). I have ordered a 64GB Sammy which I should get in 1/2 week so I can test. Course I wouldn't be doing exactly what you would be doing so the test would only show that the G3 could read/write to it. I will only use it as external storage. I don't really "need" 64GB but it will allow me to be a bit more sloppy vis a vis nandroid backups.
It could be that after you format yours, that it will suddenly work just fine. Then again I just had a thumb drive go belly-up from I/O errors - once in a great while, it happens.

KrisM22 said:
... Moto says it's limit is 32GB. Folks have, I believe, used much bigger cards on it. Don't know what is the limiting factor .
Click to expand...
Click to collapse
I've got a 128gb in my Moto G (3rd - XT1540 2GB), and I have used the card for a long time. It works just fine for me, and the space is obviously fantastic to have. Every now and then (every few months or so, I'd say - maybe 3 times in the 18 months I've had it), it does become corrupted, though, and I get those same error messages. A backup, wipe/re-format, and restore, and I put it right back in my phone and it works just fine again. Seems like that's happened in other devices, though, too.
The card is a SanDisk Ultra SL128 (Class 10/UHS-1, man'd Jan 2016). I've only ever used it for external storage, never adopted, and I've only ever formatted the card as FAT32, using my PC. I'm running stock Android 6.0 24.24.1 at the moment, with TWRP.

beachfl said:
I've got a 128gb in my Moto G (3rd - XT1540 2GB), and I have used the card for a long time. It works just fine for me, and the space is obviously fantastic to have. Every now and then (every few months or so, I'd say - maybe 3 times in the 18 months I've had it), it does become corrupted, though, and I get those same error messages. A backup, wipe/re-format, and restore, and I put it right back in my phone and it works just fine again. Seems like that's happened in other devices, though, too.
The card is a SanDisk Ultra SL128 (Class 10/UHS-1, man'd Jan 2016). I've only ever used it for external storage, never adopted, and I've only ever formatted the card as FAT32, using my PC. I'm running stock Android 6.0 24.24.1 at the moment, with TWRP.
Click to expand...
Click to collapse
Thanks - Becoming corrupted every 6 months seems excessive, but with heavy use...? So what do you use it for? Also it sounds like you are using something other than the phone to format it...?
At least you are ready for it and just re-format it!

beachfl said:
I've got a 128gb in my Moto G (3rd - XT1540 2GB), and I have used the card for a long time. It works just fine for me, and the space is obviously fantastic to have. Every now and then (every few months or so, I'd say - maybe 3 times in the 18 months I've had it), it does become corrupted, though, and I get those same error messages. A backup, wipe/re-format, and restore, and I put it right back in my phone and it works just fine again. Seems like that's happened in other devices, though, too.
The card is a SanDisk Ultra SL128 (Class 10/UHS-1, man'd Jan 2016). I've only ever used it for external storage, never adopted, and I've only ever formatted the card as FAT32, using my PC. I'm running stock Android 6.0 24.24.1 at the moment, with TWRP.
Click to expand...
Click to collapse
That may not be drive corruption but rather a corrupted file or files. If it is localize drive corruption it may still be there without having any impact until some data is written to that part of the drive. Unlike platter based hard drives, when these drives actually start to fail they may invoke a built in data protection (dirty bit) which resembles being locked in read only mode preventing the drive from being formatted which is obviously not your case. Have you ever done a sector scan of the drive, eg chkdsk <driveletter> /f /r or done a full format (as opposed to quick format)? Either of those things may flush out localized damage and the scan might fix it but they would take a long time.

KrisM22 said:
Thanks - Becoming corrupted every 6 months seems excessive, but with heavy use...? So what do you use it for? Also it sounds like you are using something other than the phone to format it...?
At least you are ready for it and just re-format it!
Click to expand...
Click to collapse
Yeah I guess it is kinda a small PITA lol. Could just be from me starting and cancelling or moving too many things at once, I don't know.
I've never actually come close to needing all that space to TBH. I could probably do just fine with a 64, but it's nice to know I could record or store hours of HD video, for example, if I need it. I got nearly 30 gigs of music on it. I keep tv and movies on there, too, in case I get caught bored somewhere. Full Nandroid and Titanium backups are on there, as well.
I use a microSD adapter and a small (76 kb) utility for Windows called FAT32Format (Ridgecorp).
---------- Post added at 22:00 ---------- Previous post was at 21:45 ----------
IronTechmonkey said:
That may not be drive corruption but rather a corrupted file or files. If it is localize drive corruption it may still be there without having any impact until some data is written to that part of the drive. Unlike platter based hard drives, when these drives actually start to fail they may invoke a built in data protection (dirty bit) which resembles being locked in read only mode preventing the drive from being formatted which is obviously not your case. Have you ever done a sector scan of the drive, eg chkdsk <driveletter> /f /r or done a full format (as opposed to quick format)? Either of those things may flush out localized damage and the scan might fix it but they would take a long time.
Click to expand...
Click to collapse
I've had that problem before, too, but not on the 128 I have in my phone now. That is very frustrating. One of my 32 gb cards suddenly went into "read-only" mode as you describe, and nothing I can do will get it useable again. All the files are still readable from it (except the part of one huge video file that is on the bad sector that seems to have caused the problem).
So right, my 128 card doesn't have that problem, and seems to be corrupted files, as you say, not the drive itself. I do actually do what you talk about - when I do find I have to re-do the 128 sd card in my phone, I run a Windows chkdsk /r before I re-format it, and a chkdsk /f afterward, as a check. The chkdsk /r does take quite a while, yeah .. a few hours.
Cheers

beachfl said:
Yeah I guess it is kinda a small PITA lol. Could just be from me starting and cancelling or moving too many things at once, I don't know.
I've never actually come close to needing all that space to TBH. I could probably do just fine with a 64, but it's nice to know I could record or store hours of HD video, for example, if I need it. I got nearly 30 gigs of music on it. I keep tv and movies on there, too, in case I get caught bored somewhere. Full Nandroid and Titanium backups are on there, as well.
I use a microSD adapter and a small (76 kb) utility for Windows called FAT32Format (Ridgecorp).
---------- Post added at 22:00 ---------- Previous post was at 21:45 ----------
I've had that problem before, too, but not on the 128 I have in my phone now. That is very frustrating. One of my 32 gb cards suddenly went into "read-only" mode as you describe, and nothing I can do will get it useable again. All the files are still readable from it (except the part of one huge video file that is on the bad sector that seems to have caused the problem).
So right, my 128 card doesn't have that problem, and seems to be corrupted files, as you say, not the drive itself. I do actually do what you talk about - when I do find I have to re-do the 128 sd card in my phone, I run a Windows chkdsk /r before I re-format it, and a chkdsk /f afterward, as a check. The chkdsk /r does take quite a while, yeah .. a few hours.
Cheers
Click to expand...
Click to collapse
Great that you're running chkdsk on it. May be caused if you cancel or something happens in the middle of a move. Only other thing I could suggest is to do your format on the phone itself, after you've done everything else on the PC. Don't know if that would make a difference. Shouldn't but I've run across vy experienced folks saying to do that. But... Yeah you've got me hankering to put a 128GB on it...
edit: for read only cards before you trash them I would run them by gparted just to see if re-creating the MBR and partition would change its mind. I have successfully done that with thumb drives but not with cards/adapter/reader.

KrisM22 said:
Great that you're running chkdsk on it..
edit: for read only cards before you trash them I would run them by gparted just to see if re-creating the MBR and partition would change its mind. I have successfully done that with thumb drives but not with cards/adapter/reader.
Click to expand...
Click to collapse
Yeah, thanks for reminding me about fixing the errors, IronTechmonkey. It's kinda an important step I forgot to mention.
I not sure I have the bad card still. I didn't think about GParted, should have. I tried Paragon, among other things, but to no avail.

What speeds are folks getting from a U3 SDE card? I bought what I thought was a 100/60MB/s card and it does about what my old PNY card did - R=40-50, W=34-40MB/s. Is the phone the limiting factor or did I get a bum card?

KrisM22 said:
What speeds are folks getting from a U3 SDE card? I bought what I thought was a 100/60MB/s card and it does about what my old PNY card did - R=40-50, W=34-40MB/s. Is the phone the limiting factor or did I get a bum card?
Click to expand...
Click to collapse
AFAIK the the phone hardware/OS is unlikely to meet the advertised speeds of the cards. Likewise and perhaps more so for USB 2.0 ports and anything using MTP.
I dont know how this compares but for what it is worth: With a Sandisk Utra SDHC (Class 10 - Video, Ultra High Speed Class 1 - whatever that jargon means) touting 80 MB/s read speeds and 40 MB/s* write speeds; the read speeds did consistently approach the rating (getting hot enough to scorch the logo) and the wite speed occasional did. Another factor is the size of files being copied, larger quantities of smaller files taking more time per MB, unless using some dedicated test utility I've never actually done a test of SD r/w speeds on the device. What are you using to measure those?
* In re write speed ratings: Digging into the small print of the specifications may reveal that the manufacturer uses different size cards each for the reed and write speed ratings, effectively padding the write speeds by citing test results from smaller capacity cards.

IronTechmonkey said:
AFAIK the the phone hardware/OS is unlikely to meet the advertised speeds of the cards. Likewise and perhaps more so for USB 2.0 ports and anything using MTP.
I dont know how this compares but for what it is worth: With a Sandisk Utra SDHC (Class 10 - Video, Ultra High Speed Class 1 - whatever that jargon means) touting 80 MB/s read speeds and 40 MB/s* write speeds; the read speeds did consistently approach the rating (getting hot enough to scorch the logo) and the wite speed occasional did. Another factor is the size of files being copied, larger quantities of smaller files taking more time per MB, unless using some dedicated test utility I've never actually done a test of SD r/w speeds on the device. What are you using to measure those?
* In re write speed ratings: Digging into the small print of the specifications may reveal that the manufacture uses different size cards each for the reed and write speed ratings, effectively padding the write speeds by citing test results from smaller capacity cards.
Click to expand...
Click to collapse
Thanks.
Interesting - so you were testing it on windows (?) I did test them on linux and got W=74 on the PNY and 77MBs on the Samsung. That's through a USB3 cardreader.
On the phone I used A1 SD Bench, SD card test, and disk speed test.
Off to try windows...
I was just going to boot up a WinPE and test it there. What prog did you use to test it?

Yes, both of these cards test at about R=81 , W=66.

KrisM22 said:
Thanks.
Interesting - so you were testing it on windows (?) I did test them on linux and got W=74 on the PNY and 77MBs on the Samsung. That's through a USB3 cardreader.
On the phone I used A1 SD Bench, SD card test, and disk speed test.
Off to try windows...
I was just going to boot up a WinPE and test it there. What prog did you use to test it?
Click to expand...
Click to collapse
Yes, Windows 7, which reports file data transfer speeds in the copy process window so I did not use a utility. I've done this enough times in geneal, and a few times specifically with large files and a stopwatch, so I know the speed in the file copy window is relatively accurate (for single large files). The speeds you get on linux seem reasonable. I'll test A1 SD Bench on Osprey when I have a chance. Thanks.
---------- Post added at 11:09 PM ---------- Previous post was at 11:08 PM ----------
KrisM22 said:
Yes, both of these cards test at about R=81 , W=66.
Click to expand...
Click to collapse
Also seemingly reasonable.

My card seem to be working just fine on my Lineage OS. I rebooted by device and now it says it's corrupted. Is there any way out? Will I be able to get my data back?

jay.bhadra1995 said:
My card seem to be working just fine on my Lineage OS. I rebooted by device and now it says it's corrupted. Is there any way out? Will I be able to get my data back?
Click to expand...
Click to collapse
My suggestion would be to copy whatever you can off it and re-format it asap. If you can't read it via phone, try PC.
EDIT: I am assuming you are using it as external. If you are using it as internal, I believe you have lost everything. I know of nothing that can read it. GPARTED can only re-add an MBR and a partition and make it usable again, but all data is lost.

KrisM22 said:
My suggestion would be to copy whatever you can off it and re-format it asap. If you can't read it via phone, try PC.
EDIT: I am assuming you are using it as external. If you are using it as internal, I believe you have lost everything. I know of nothing that can read it. GPARTED can only re-add an MBR and a partition and make it usable again, but all data is lost.
Click to expand...
Click to collapse
Yeah. I copied everything and made a backup. Luckily I use it only as a storage device and not an internal drive for apps. But how do I re-format it? I tried using the format option that my phone gives me but to no avail.

jay.bhadra1995 said:
Yeah. I copied everything and made a backup. Luckily I use it only as a storage device and not an internal drive for apps. But how do I re-format it? I tried using the format option that my phone gives me but to no avail.
Click to expand...
Click to collapse
Do you have a little card reader so you can plug it into your PC?

KrisM22 said:
Do you have a little card reader so you can plug it into your PC?
Click to expand...
Click to collapse
No. Sadly I don't. Is there no other way round to format it?

Just ordered a 400gb micro SD.

Been using a 200gb that came free with the purchase of the V20. Gonna pass this off to my son. I'm running out of room and wanna carry more. This 400gb should give me enough room. ?
Anybody else using one in the v30/+?

All set up. 367gb free. I can pretty much use the internal 128gb for whatever phone wise (apps), and this for the downloads and music (I store mine locally). I do have a streaming account though, but prefer my collection on my SD card.

20degrees said:
All set up. 367gb free. I can pretty much use the internal 128gb for whatever phone wise (apps), and this for the downloads and music (I store mine locally). I do have a streaming account though, but prefer my collection on my SD card.
Click to expand...
Click to collapse
I like my music on the phone also. Which card did you get?

bilbo60 said:
I like my music on the phone also. Which card did you get?
Click to expand...
Click to collapse
Sandisk Ultra 400GB Micro SDXC UHS-I Card with Adapter.
Some reason it won't post the link. Search for that on Amazon.

20degrees said:
Sandisk Ultra 400GB Micro SDXC UHS-I Card with Adapter.
Some reason it won't post the link. Search for that on Amazon.
Click to expand...
Click to collapse
Thanks. Found them. Probably go with the 200 GB.

bilbo60 said:
Thanks. Found them. Probably go with the 200 GB.
Click to expand...
Click to collapse
The Samsung cards are really good too. They offer a 256gb.

20degrees said:
All set up. 367gb free. I can pretty much use the internal 128gb for whatever phone wise (apps), and this for the downloads and music (I store mine locally). I do have a streaming account though, but prefer my collection on my SD card.
Click to expand...
Click to collapse
Wow. 400GB.
Here's the link you couldn't post for some reason, if other people need it:
Sandisk Ultra 400GB Micro SDXC UHS-I Card with Adapter - SDSQUAR-400G-GN6MA
https://www.amazon.com/Sandisk-Ultr...21160&sr=8-2&keywords=400gb+microsd+card&th=1
Also, other size choices on that page.
My last three phones (gen3 Galaxy Nexus, LG Nexus 5, Moto XT1225) didn't have microSD cards, although the 2014 Moto XT1225 (unofficial smaller version of the Moto Nexus 6) did have 64GB internal storage. I ordered a 256GB card from that page -- which eventually will be in addition to my 128GB V30+ when it comes.
Now trying to decide what my wife's LG V30 will get. That 200GB is only $73 right now and looks very tempting for her phone.

ChazzMatt said:
Wow. 400GB.
Here's the link you couldn't post for some reason, if other people need it:
Sandisk Ultra 400GB Micro SDXC UHS-I Card with Adapter - SDSQUAR-400G-GN6MA
https://www.amazon.com/Sandisk-Ultr...21160&sr=8-2&keywords=400gb+microsd+card&th=1
Also, other size choices on that page.
My last three phones (gen3 Galaxy Nexus, LG Nexus 5, Moto XT1225) didn't have microSD cards, although the 2014 Moto XT1225 (unofficial smaller version of the Moto Nexus 6) did have 64GB internal storage. I ordered a 256GB card from that page -- which eventually will be in addition to my 128GB V30+ when it comes.
Now trying to decide what my wife's LG V30 will get. That 200GB is only $73 right now and looks very tempting for her phone.
Click to expand...
Click to collapse
$73 for a 200gb doesn't seem bad, it's actually a way better value compared to the 400gb. But I was going for size. My 200gb held up well for the time I used it though.

20degrees said:
All set up. 367gb free. I can pretty much use the internal 128gb for whatever phone wise (apps), and this for the downloads and music (I store mine locally). I do have a streaming account though, but prefer my collection on my SD card.
Click to expand...
Click to collapse
Could you please test what's the write speed of this card for constant transfer?
Sent from my GT-I9506 using Tapatalk

DonAndress said:
Could you please test what's the write speed of this card for constant transfer?
Click to expand...
Click to collapse
Using "A1 SD Bench" gives the results posted below. My PC doesn't have USB 3.0 yet as this spring is my lustrum update year for the motherboard, ram and CPU. So it's not really worth testing on there.
Edit: Results posted on the following post. I forgot to attach them and edit mode didn't give me the option of doing so.

Forgot results.

If anyone wants some stats on the card here is an post from the V20 forum and what I got of test:
Okay I got the Card of SanDisk Ultra micro SDXC UHS-I Card 400 GB "Well actually less then 400 GB because of companies continuously lies which seems to be of no end to it" and it is running much faster then my old samsung 128 evo or evo+. It's not running as fast as your 128 GB samsung pro+ but anyway il find the results. Iv made test with 3 programs on the V20.
First one is A1 SD Bench which you used:
Read 78.14 MB/s - Write 41,21MB/s
Read 78,19MB/s - Write 41,37MB/s
Read 79,45MB/s - Write 42,97MB/s
Read 78,50MB/s - Write 41,07MB/s
Then SD Card Test
Read 88 MB/s - Write 42 MB/s
Read 87 MB/s - Write 42 MB/s
Read 88 MB/s - Write 40 MB/s
Read 89 MB/s - Write 42 MB/s
and last without any advertising AndroBench:
Read 84.16 MB/s - Write 46,59 MB/s
Read 84.39 MB/s - Write 50,16 MB/s
Read 84.81 MB/s - Write 53,23 MB/s
Read 84.25 MB/s - Write 55,9 MB/s
As you can see the write is far from as good as the Card you had of 128 GB... But of cause this is 400 GB and still a good deal faster then my old ones I had. Put a lot of stuff on it already. I also found out my Laptop is getting old as it corrupts the image of the UHD video when playing.... My Mobile seems to actually have more juice in that department then my laptop as it runs fine on the mobile. I tested which quality I wanted to run on my mobile for best video results and used the Pagan New Year in the Winter for it. I did a look at it yesterday and It seems FHD and 60 frames a second gave the best results on the V20.

Jesus is God Almighty said:
"Well actually less then 400 GB because of companies continuously lies which seems to be of no end to it"
Click to expand...
Click to collapse
Flash memory has a finite number of writes to each page before they 'wear out' to some headroom is required to spread out the read/write cycles and manage the storage. This headroom is the difference between the actual size of the card and the amount you get to use. It's called wear levelling. An explanation can be found on Wikipedia.

400GB is a lot! If you use a program like Aftiss (which is on the forums, just give it a quick search) and use the setting "0" when formatting the card, that whole 400GB will turn into Internal Storage. I have it set up that way on my Verizon V30 with a 128GB microSD Card. Just do a backup beforehand just in case anything goes wrong (which it shouldn't.)

Charbleach said:
400GB is a lot! If you use a program like Aftiss (which is on the forums, just give it a quick search) and use the setting "0" when formatting the card, that whole 400GB will turn into Internal Storage. I have it set up that way on my Verizon V30 with a 128GB microSD Card. Just do a backup beforehand just in case anything goes wrong (which it shouldn't.)
Click to expand...
Click to collapse
Can you eject the card and use it elsewhere to modify its contents?

20degrees said:
Can you eject the card and use it elsewhere to modify its contents?
Click to expand...
Click to collapse
i want to know this too

20degrees said:
Can you eject the card and use it elsewhere to modify its contents?
Click to expand...
Click to collapse
bountyman334 said:
i want to know this too
Click to expand...
Click to collapse
Probably not since the microSD becomes the internal storage where all of the "active" system & app files (user changes) are stored
edit:
the following should explain it
https://fossbytes.com/android-sd-card-internal-storage-adoptable-storage/
so it might be possible, but there are possible consequences (data corruption, system messed up, etc.) - a reject beforehand is highly recommended

20degrees said:
Can you eject the card and use it elsewhere to modify its contents?
Click to expand...
Click to collapse
Oops! Didn't see this reply. You are not able to remove the SD Card, well at least not recommended to, because if you removed it and some apps had placed necessary files on it, they won't be able to run. I would strongly recommend against it just because of the dangers that could come with it.

PaulNexus7 said:
Flash memory has a finite number of writes to each page before they 'wear out' to some headroom is required to spread out the read/write cycles and manage the storage. This headroom is the difference between the actual size of the card and the amount you get to use. It's called wear levelling. An explanation can be found on Wikipedia.
Click to expand...
Click to collapse
Most harddrive makers and memory card makers has always cheated with the real amount of space.
The last company I know that kept the rules of real storage was IBM who made the Deathstars as they sadly ended up being known by. They then sold there harddrive line to another company, Hitachi or something I think it was. But the thing is when you bought a 20, 40 GB or 60 GB harddrive from IBM you actually got those GB and no cheating.
---------- Post added at 09:23 PM ---------- Previous post was at 09:17 PM ----------
Charbleach said:
400GB is a lot! If you use a program like Aftiss (which is on the forums, just give it a quick search) and use the setting "0" when formatting the card, that whole 400GB will turn into Internal Storage. I have it set up that way on my Verizon V30 with a 128GB microSD Card. Just do a backup beforehand just in case anything goes wrong (which it shouldn't.)
Click to expand...
Click to collapse
I rather not as I many times pop it out and into my computer - I don't have time for the stupidity of connecting the phone to the computer and having all these issues with it which should not have been. So mostly because of frustration I end up just popping the SD out of the phone and putting it directly into my computer. Then you can do multiple things on it without any error popping up and have top speed.

I'm using the 400GB with my v30+ simply for Rom back-ups and storing my music.