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problems wit 32 GB unbranded memory card

I wonder if anyone has got similar problem. I have been given unbranded 32GB card and it seem to have occasional problems with files transfer/copy from PC. Music files and videos can't be played, photos can't be view etc. Yesterday I copied couple of text files and yes there are on the card but they are empty (no text). After format card works for a while and somehow gets corrupted. Just wondering if there is any working solution (apart of course from buying new card)
Many thx

7932 said:
I wonder if anyone has got similar problem. I have been given unbranded 32GB card and it seem to have occasional problems with files transfer/copy from PC. Music files and videos can't be played, photos can't be view etc. Yesterday I copied couple of text files and yes there are on the card but they are empty (no text). After format card works for a while and somehow gets corrupted. Just wondering if there is any working solution (apart of course from buying new card)
Many thx
Click to expand...
Click to collapse
Hi,
Sorry to say this,but over the years people have always enjoyed good experiences with Kingston and Sandisk sd cards.
Most sd card problems come from any other brands.
Morale of the story is:
You get what you pay for.

You got a fake card like me if you got it from eBay you need open case asap
Sent from my Sensation using Tapatalk

This is why when I was going to buy a cheap card of ebay I changed my mind and spent a little extra money and just ordered a samsung 32gb class 10.
See it as a lesson learned.

Actual card was a present from someone who bought it in China yes I know...at first I thought it was 2GB fake I read in this forum but it is 32 GB capacity. Last night I tried to copy 4 mp4 files coming from the same source: I can 2 play and other 2 I get error...strange, anyway lesson learned

I had the same problem with a 32gb unbranded card that i got off ebay. It was a legitimate 32gb card but my phone would not detect it. I thought about keeping it but anytime i plugged it into my laptop it would take ages to read or write anything and would get incredibly hot. I sent it back in the end. I guess its worth it to buy a branded disk.

7932 said:
I wonder if anyone has got similar problem. I have been given unbranded 32GB card and it seem to have occasional problems with files transfer/copy from PC. Music files and videos can't be played, photos can't be view etc. Yesterday I copied couple of text files and yes there are on the card but they are empty (no text). After format card works for a while and somehow gets corrupted. Just wondering if there is any working solution (apart of course from buying new card)
Many thx
Click to expand...
Click to collapse
Just download H2testw 1.4, and run it to test your card.
Here's the download link and instructions:
http://www.softpedia.com/get/System/System-Miscellaneous/H2testw.shtml

Thx a lot for link will give it a go

minor glitches when playing video from external SD card (Sandisk 16GB)

When I play video stored on my internal storage, it is smooth. I can watch a 90 minute movie video without noticing any glitch at all.
When I play video stored on my external storage, there are glitches. One glitch every 1-2 minutes. These are not big glitches, just a brief deviation that gets your attention. If I listen, I think it is skipping a fraction of a second of the audio. (It may be skipping a fraction or second of the video display also, but my eye doesn't detect it). It's not a huge deal: ...... but just something that I notice and it's a minor irritation.
Since it occurs only on external sd, not internal storage, I assume it is the speed of the sd card. I have a 16GB Sandisk SD card. If I remember right, it's "Class 6"
I don't hear any glitches when listening to MP3's off of external sd, works just fine with no glitch ever.
SUMMARY: no problems on internal sd, no problems on mp3's. The only problems are videos on external sd.
It seems to me that the external sd can't quite keep up with the high transfer rate required for video playback.
Has anyone else seen this?
Any observation about which SD cards do this and which don't?
By the way I'm running rooted 2.3.6 from qkster's package, with Zen's Infusion A kernel. Holo launcher.
I haven't tried boosting to 1600Mhz. I'll try that and report the results later.

electricpete1 said:
I haven't tried boosting to 1600Mhz. I'll try that and report the results later.
Click to expand...
Click to collapse
I just tried it - no difference. Glitches still occurred with cpu max frequency set to 1600.

You should try to format your external card and then try again.
Also, it could be your external card is to slow on reading
Should not be that slow if it is class 6 though...
Maybe try other card on your infuse with same video file.
Sent from my SGH-I997 using xda app-developers app

zpzp96 said:
You should try to format your external card and then try again.
Also, it could be your external card is to slow on reading
Should not be that slow if it is class 6 though...
Maybe try other card on your infuse with same video file.
Sent from my SGH-I997 using xda app-developers app
Click to expand...
Click to collapse
Thanks. I have also noted the SD card media scanner runs to scan my external sd card more frequently... almost every time the phone comes out of sleep. I think this symptom coincides with me adding more files to my external SD.
I will try reformatting now as you recommended.
Question: is it better to reformat sd card in the phone or on the pc?
(if on the phone, there is no question of file system... I'll let the phone pick the format. If on pc, I'm not sure what format to pick... I'm using Entropy's kernel with voodoo lagfix enabled... does that mean external cannot be formatted to FAT32? )

The bigger problem is the constant scanning every time I turn the screen on. It was a nuisance, and I think it was draining my battery.
It gave the error message "sd card unexpectedly removed".
There are threads on this for some other Samsung devices.
http://forum.xda-developers.com/showthread.php?t=1933743
http://forum.xda-developers.com/showthread.php?t=2031009
There was a suggestion Sandisk cards in Samsung devices tend to have the problem.
I transferred my files to my pc, formatted sd in the phone, no problem until I transferred files back... then problem started recurring.
I reformatted in the PC to Fat32. Put files back on. Seems to be much better. But very close monitoring using SD Card Monitor program....
https://play.google.com/store/apps/...t=W251bGwsMSwyLDEsImNvbS5zZGNhcmRtb25pdG9yIl0.
... shows it is still have problems. I'm going to break down and buy another sd card. Perhaps another brand.

electricpete1 said:
The bigger problem is the constant scanning every time I turn the screen on. It was a nuisance, and I think it was draining my battery.
It gave the error message "sd card unexpectedly removed".
There are threads on this for some other Samsung devices.
http://forum.xda-developers.com/showthread.php?t=1933743
http://forum.xda-developers.com/showthread.php?t=2031009
There was a suggestion Sandisk cards in Samsung devices tend to have the problem.
I transferred my files to my pc, formatted sd in the phone, no problem until I transferred files back... then problem started recurring.
I reformatted in the PC to Fat32. Put files back on. Seems to be much better. But very close monitoring using SD Card Monitor program....
https://play.google.com/store/apps/...t=W251bGwsMSwyLDEsImNvbS5zZGNhcmRtb25pdG9yIl0.
... shows it is still have problems. I'm going to break down and buy another sd card. Perhaps another brand.
Click to expand...
Click to collapse
Your SD card has problem for sure.
It shouldn't scan that often and it shouldn't say it is unexpectedly removed.
Seems either phone's card reader or the card is very unstable. That is why you are having problems in video files.
If the SD card benchmark program shows that tour SD card is performing bad, I beehive you got fake Sandisk SD card or really low class SD card.
From this point, I believe getting new SD card is the best solution here.
PS. You should put the SD card on PC then run benchmark on PC to see how it performs on PC. If it performs too much faster on PC, then the problem might be your phone's card reader.
Sent from my SGH-I997 using xda app-developers app

Symptom went away with new sd
Before replacing the sd card, I had 100+ sd card events recorded by theSD Card Monitor program in a 24 hours period.
After replacing the sd card, I have 0 events recorded by the SD Card Monitor program in a 24-hour period.
The new SD is a Lexar 32GB Class 10 for $45 at Target. (preformatted as FAT32)
It was cheaper than the $70 32GB SanDisk they're selling at Best Buy.
I'm tempted to say the problem is solved.
On the other hand, one thing I noticed on the old SD was that the old sd symptoms got worse with time... I don't think they were there when the card was new. So I'm not sure if I've really solved the problem or just reset the clock waiting for the new SD to act up under whatever influences degraded the old one. Time will tell. For the time being, life is good. That scanning upon coming out of sleep was a real PITA.. slowed down the phone just when you picked it up to use it... actually dropped two phone calls recieved while phone was sleeping.. I presume because the phone wasn't able to handle scanning and answering at the same time.

Perhaps it was a fake SanDisk. Where'd you buy it from? Lots of fakes on eBay.

I bought the SanDisk (that had the problems) at Best Buy.

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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200GB MicroSD card issues?

Picked up a high-speed MicroSD card and formatted it in my moto z. My device gets hot and full charge battery only lasts about three hours. When I remove the MicroSD card everything goes back to normal.
Using custom kernel and prerooted stock rom.
Anybody having any issues like mine or can shed some light on how to fix the issue? Thanks!

happened to me in moto x force and moto z
with 128gb lexar (works flawlessly on samsung tab a)
changed to sandisk uhs-i and no problems
might be moto is picky when it comes to sd cards

Yep this is a lexar card. Was on sale for $100. I guess I'll have to return it. Thanks for letting me know.

I went back to stock encrypted and it seemed to fix the issue.

don't count on it

Just FYI...
I've a 128 GB 1000x Lexar on my Moto Z with stock kernel and no issues with it... :fingers-crossed:

So another update, turns out Android sucks at indexing and it was constantly scanning my 5800 FLAC files all the time. 100% battery would go to 10% in just under three hours, it had nothing to do with it being a lexar card!
Solution? I put a .nomedia file in my music folder and enabled my music player to ignore that and it scans my whole library with ease. I went to work at 8:30 am today and just got home (6:18 pm) and my battery is still at 85%.

Turbojugend said:
So another update, turns out Android sucks at indexing and it was constantly scanning my 5800 FLAC files all the time. 100% battery would go to 10% in just under three hours, it had nothing to do with it being a lexar card!
Solution? I put a .nomedia file in my music folder and enabled my music player to ignore that and it scans my whole library with ease. I went to work at 8:30 am today and just got home (6:18 pm) and my battery is still at 85%.
Click to expand...
Click to collapse
Really a weird issue...
I've my MP3 and videos on my SD card and I've noted no issue with them...

I've tried multiple high speed UHS-I cards, and formatted as internal, but all of them were either flagged by the phone as "too slow and might affect performance" or gave me heat and battery life issues.
And it would take five minutes after a reboot to show all app icons, or apps would lose login passwords, games lost saves and other annoying issues.
Formatting it as external storage, and just setting the camera to record directly to it works fine though.
Someone from Xiaomi actually said they're not adding or supporting MicroSD as internal due to them always having issues apparently. And it seems to be true.

Shadowdancer123 said:
...
Formatting it as external storage, and just setting the camera to record directly to it works fine though.
....
Click to expand...
Click to collapse
This is in fact my actual situation... no issues with Lexar 128GB 1000x.

enetec said:
Really a weird issue...
I've my MP3 and videos on my SD card and I've noted no issue with them...
Click to expand...
Click to collapse
Maybe because I am using FLAC and have 5900 of them on it hahaha.

Turbojugend said:
Maybe because I am using FLAC and have 5900 of them on it hahaha.
Click to expand...
Click to collapse
Probably! :laugh:

Btw, another reason to not use it formatted as internal storage, is the immense power requirements MicroSD can spend at max write speed.
According to Wikipedia, as much as 100mA, which really explains why the phone heats up when it's formatted that way. And that doesn't include the consumption of the sd card controller.
https://en.m.wikipedia.org/wiki/Secure_Digital

Shadowdancer123 said:
Btw, another reason to not use it formatted as internal storage, is the immense power requirements MicroSD can spend at max write speed.
According to Wikipedia, as much as 100mA, which really explains why the phone heats up when it's formatted that way. And that doesn't include the consumption of the sd card controller.
https://en.m.wikipedia.org/wiki/Secure_Digital
Click to expand...
Click to collapse
It didn't matter how I had it formatted before it was still getting super hot. Now that I haven't been using it, the issue must have been Android trying to index all the files as it's been running fine all week now that I have that .nomedia file in my music folder.

Does anyone know of a 128 card that can handle is phone?? Im gonn try the Samsung Pro+ 128

masterjay21 said:
Does anyone know of a 128 card that can handle is phone?? Im gonn try the Samsung Pro+ 128
Click to expand...
Click to collapse
Using Lexar 1000x with no issues at all here...

enetec said:
Using Lexar 1000x with no issues at all here...
Click to expand...
Click to collapse
And at last... I had issues too!
On sdcard I store TWRP backups (no issues...), Titanium backups (no issues...), Maps (no issues...) and.... Pics & videos... and here I begin to see some weird behaviour...
First I saw Gallery had difficulties on showing pics thumbnials if I go fast between them... then it begins to show some "damaged" pics... at last I saw Camera app begins to crash just after taking a pic... (set to save on sdcard...)
So, I removed sdcard, connected to a PC and copied all files... The copy requested A LOT of time since of read difficulties, BUT all files was ok at last. :highfive:
Then I formatted sdcard and extensively tested with h2testw with no issues and constant speed.
So I formatted again and copied all files back in.
Then I've found a way to have it working fine with Moto Z... (I think... :fingers-crossed
Problem is that Moto Z is set to use a too small cache size for modern sdcards (128 KB) and this probably generate sync issues (and when this happens I saw CPU go wild and phone become warm... in a very similar way with Windows when it is having issues with USB keys... )
So I installed "SD-booster" app from Play Store (yes, it requires root...) and used it to resize cache to a more suitable value of 2048 KB and I haven't had any issue since then... more, my gallery has never been so fast scrolling and taking a LOT of pics in seconds or slow motion video isn't an issue at all now...

masterjay21 said:
Does anyone know of a 128 card that can handle is phone?? Im gonn try the Samsung Pro+ 128
Click to expand...
Click to collapse
I'm using a Samsung Evo 128go and I have no issue

So, I currently only use my 128gb Samsung UHS1 card for external storage only because of the issues other have experienced using it as internal. Not sure if it's on anyone's radar but Sandisk just announced a new micro sd card made specifically to be able to handle the read/write requirements.
http://www.droid-life.com/2017/01/05/sandisks-new-256gb-a1-microsd-card-wants-apps/

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.
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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!
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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).
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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.
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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
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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.
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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?
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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.
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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?
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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.
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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?
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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.
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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.
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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?
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No. Sadly I don't. Is there no other way round to format it?