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[Q] Slow/Poor micro-sd performance

Hi, i bought some days ago an 8GB class 10 micro sd card, hoping it would speed up my phone (i was using app2sd+ with Kyrillo's ROM v7.1).
I didn't notice any diference compared to my old 4GB class 2 card, so i installed SD Tools app to test the speeds, and i realized all the cards i put in my phone get 4MB/s as the maximun write speed, i tried many different sd cards, class 2 and 10 and there's no difference. Then i tried the same cards in my girlfriend's Galaxy Ace and the speeds were much higher, 7~12 MB/s write speed.
I thought it was a rom problem, so i backed up with Titanium Backup and flashed a stock ROM (JPM), but the speeds remain the same (around 4 MB/s for writing), i also tried changing the buffer size from 128kb to 1024, 2048, 4096 with "SD Booster" and "SD Speed Increase" apps, but no good results...
Could my phone be faulty?
Is there any configuration i can try to make my sd card faster? any command line?
What are the speeds you reach with "SD Tools" and classes of your SD card?
Best Regards!

I'm not sure, but I think there's nothing you can do....
Mine is a 16GB class 6 and it's the same, whatever I try. Before had 8GB - was the same.
Whatever I wrote into the 'read ahead buffer'...
But maybe anyone else has an idea?

Try changing the buffer to 0 as sometimes that works.
Sent from my GT-I5800 using XDA App

dilzo said:
Try changing the buffer to 0 as sometimes that works.
Click to expand...
Click to collapse
TNX for the tip, but unfortunately SAME RESULT...

i also get the same speeds..
i think thats a bug with sd tools.
By the way has any one tried data2sd/apps2sd v3? do you face lags?
also do you people have SD or SDHC

I belive that sdtools has a bug. Or is seriously faulty. I have 16GB class 2 sdcard and sdtools claims that my read and write speeds are equivavlent to class 6 card (values range from 6.x/6.x to 8.x/7.x, write/read, respectively (depending on read_ahead_kb values). And I know for a fact that this really cheap sdcard does not have such performance. You can try antutu benchmark, free app on market, which provides a bit more accurate results plus you can select what to benchmark. My card gets 3.0MB/s read and 2.0 MB/s write with default buffer values. Which is more accurate than sdtools. Especially because disks (any kind) usually have higher read rate than write rate (because it is easier to read data than to write it and 'cause we usually perform much more reading than writing, so it is optimized for read operations).

mrvek said:
I belive that sdtools has a bug. Or is seriously faulty. I have 16GB class 2 sdcard and sdtools claims that my read and write speeds are equivavlent to class 6 card (values range from 6.x/6.x to 8.x/7.x, write/read, respectively (depending on read_ahead_kb values). And I know for a fact that this really cheap sdcard does not have such performance. You can try antutu benchmark, free app on market, which provides a bit more accurate results plus you can select what to benchmark. My card gets 3.0MB/s read and 2.0 MB/s write with default buffer values. Which is more accurate than sdtools. Especially because disks (any kind) usually have higher read rate than write rate (because it is easier to read data than to write it and 'cause we usually perform much more reading than writing, so it is optimized for read operations).
Click to expand...
Click to collapse
antutu give me 3.x and 4.x for write and read speed respectively!!
8gb class 10

That is odd. Do you have a card reader? Maybe you can bench from pc and see the results. I have only 2 sdcards, both class 2 and the results I get are to be expected from class 2 cards. There is also possibility that it is a low quality component. If you feel like it try to investigate, get cards info like serial, model and manufacturer and see what you'll discover. Nowadays people are selling everything claiming it to be a better than actually is. I remember reading tests regarding SD 's where they said that same card type from same manufacturer performed about 10 times worse just because one was.made in China and the other in taiwan, or something like that. I personally would do some research but it's up to you.

mrvek said:
That is odd. Do you have a card reader? Maybe you can bench from pc and see the results. I have only 2 sdcards, both class 2 and the results I get are to be expected from class 2 cards. There is also possibility that it is a low quality component. If you feel like it try to investigate, get cards info like serial, model and manufacturer and see what you'll discover. Nowadays people are selling everything claiming it to be a better than actually is. I remember reading tests regarding SD 's where they said that same card type from same manufacturer performed about 10 times worse just because one was.made in China and the other in taiwan, or something like that. I personally would do some research but it's up to you.
Click to expand...
Click to collapse
well i did a bench mark from laptop's card reader.. it was way over 18 mbps.. cancelled the benchmark in the process as it was taking too long.. but half way read speed was definitely above 18mbps.. Also my sdhc's manufacturer is transcend. I hope this company wont betray us!!

well, in that case it might have to do with phone configuration/programming. Maybe devs could figure out why the phone does not utilize full potential of the sdcard. Perhaps low ram, (relatively) "slow" cpu, something...

mrvek said:
well, in that case it might have to do with phone configuration/programming. Maybe devs could figure out why the phone does not utilize full potential of the sdcard. Perhaps low ram, (relatively) "slow" cpu, something...
Click to expand...
Click to collapse
Good point. Hope some dev is listening!!

I have the same problem.
Samsung Galaxy 3 GT-i5800, Android Froyo firmware v2.2 build XWJPL.
I tested with two class 10 microSD cards, quality ones, but got poor transfer rates.
card1: Transcend 8GB MicroSDHC Class10 (TS8GUSDHC10) - up to 20 Mb/s
card2: Samsung 8GB SDHC Plus Class10 (MB-MP8GA/EU) - Read max. 24 Mb/s, Write max 21 Mb/s
Samsung 8GB cl10 test result (SD Tools app): Write: 4.4 Mb/s; Read 5.1 Mb/s
The card write speed should be higher than 10 Mb/s

[Q] What is the impact of SDHC class 4 vs. class 10 on a Galaxy S 4G?

Regarding SDHC classes, I've referenced the article at wikipedia about SDHC... and I understand that Class x indicates that the card supports "a sustained write speed of x MB/s" ...
So, my question is a two-parter...
1) Are there OS processes which would benefit from a Class 10 (vs. a Class 4, for example) in such a way that I would notice the "enhancement?"
2) Which applications would respond in a way that I would notice the enhancement? (I suspect that video-recording might be such an application...)
I would appreciate intelligent responses.

I have done some research on this as I am soon going to be upgrading my sd card and everything I have found suggests that for overall performance of the phone there wont be any difference between a class 4 and a class 10 other than the speed that you transfer files between your PC and your phone. Most tests I've seen usually shows double the transfer rate. And from what I understand the compression ratio is good enough on our phone's camera that it probably wont fill up the buffer with a class 4 card.

I think maybe FB will have an answer _ I recall he told me something about it

SD card upgrade

Hey guys just need a little help here im looking to buy a Dane elec either 8 or 16 gig sd card for my atrix 2 after trading in my itouch 4gen 32 gig at GameStop and getting the new nexus 7 tablet and will have about $25 left over to buy a SD card from them, will either of these SD cards cause problems with my ATRIX 2?
Sent from my MB865 using xda premium

atrix2noob said:
Hey guys just need a little help here im looking to buy a Dane elec either 8 or 16 gig sd card for my atrix 2 after trading in my itouch 4gen 32 gig at GameStop and getting the new nexus 7 tablet and will have about $25 left over to buy a SD card from them, will either of these SD cards cause problems with my ATRIX 2?
Sent from my MB865 using xda premium
Click to expand...
Click to collapse
Not as long as it is a class 6 or lower SDcard. If it is a class 6 or a class 4 you will be golden.

It doesn't list a class number would you know what number they usually are?
Sent from my MB865 using xda premium

atrix2noob said:
It doesn't list a class number would you know what number they usually are?
Sent from my MB865 using xda premium
Click to expand...
Click to collapse
Nope, because they can be from a class 2 to a class 10, and they come in all sizes and classes.... the higher the class the faster the SDcard.
You might have to do some research on the vendors website, to find out what class that card is. Again just make sure it is a class 6 or lower.

atrix2noob said:
It doesn't list a class number would you know what number they usually are?
Sent from my MB865 using xda premium
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Click to collapse
Rule of thumb is if it doesn't say then its class 2.anything higher and it should have a circle on the card with a 4, 6, 10 etc in it.
Motorola lied and I'm still locked mb865

mtnlion said:
Rule of thumb is if it doesn't say then its class 2.anything higher and it should have a circle on the card with a 4, 6, 10 etc in it.
Motorola lied and I'm still locked mb865
Click to expand...
Click to collapse
I have a 16GB class 4 that does not list the class on the card itself, but on the package and on the sandisk website it lists the model that I have as a class 4.

Just putting this info out there for anyone. I bought a 32gb class 4 SanDisk and it works flawlessly with this phone. I was skeptical at first because of the size but I've been using it for two weeks now without any problems.
Sent from my MB865 using xda premium

Just for the record, the class rating is the write speed which is more relevant because you'll want to add content to the card; reads speeds on SD cards are typically - and I say "typically" because in testing over 200 different sizes and brands one time (took a full day to do it) the typical read speed was about the same across them all on average - about 17.5MB/s (that's Megabytes per second read speed).
The write speed is what drags things down when it comes to adding content to SD cards, so... the higher the write speed, the faster the card should be able to store the content you're feeding it.
Class speed = approximate sustained write speed so...
Class 2 = 2MB/s on average sustained
Class 4 = 4MB/s
Class 6, etc up to Class 10 at 10MB/s.
Now, sustained means you have a big file like a movie file, perhaps a few hundred megabytes in size - transferring that one big file is the most efficient use of the card's write ability and will usually give you the actual class/write speed.
It's when you're transferring a lot of smaller random files that you'll notice you're taking a speed hit. Case in point:
You have a 100MB file and you transfer it to a Class 4 SD card, it'll most likely take between 25 (best possible throughput to 35 seconds on average (4 to 4.5MB/s max sustained write throughput).
Contrast that with say 12 mp3 files that total about 100MB, each file slightly different from maybe 5.5 to 10.5MB in size. Now, doing that transfer will take far longer than even the 35 seconds on the same exact Class 4 card because it requires more time to do the random writes when each file "breaks" the throughput going to the card. You're probably looking at 45 seconds or more for roughly the same amount of data but broken into smaller "random" chunks, and the speed hit gets even worse as the size of the files you're copying decreases.
If you start transferring a ton of image files like JPEGs to an SD card, about 100MB of them, oh boy... go make a cup of coffee or have lunch or something.
That's what Class speed means - it's only relevant to the sustained write speed on the card, aka how fast you can put content on it.
Hope this helps...

jimbridgman said:
I have a 16GB class 4 that does not list the class on the card itself, but on the package and on the sandisk website it lists the model that I have as a class 4.
Click to expand...
Click to collapse
Really? Never saw an unmarked one that wasnt a 2. I stand corrected.
Motorola lied and I'm still locked mb865

Fyi i'm running a Patriot class 10 card in my a2 with no problems

chriselmore said:
Fyi i'm running a Patriot class 10 card in my a2 with no problems
Click to expand...
Click to collapse
You WILL have issues so be prepared, and by all means do NOT run apps off SDcard or you WILL have issues and lose data!

Also anyone find out how to move apps on the SD to the internal space?
Sent from my MB865 using xda premium

chriselmore said:
Fyi i'm running a Patriot class 10 card in my a2 with no problems
Click to expand...
Click to collapse
Ditto. No issues yet.

In addition to not moving applications to the SDHC it might be a good idea to follow Patriot's advice regarding formatting. The suggestion was posted by Patriot in response to a review of a 32GB class 10 microSDHC.
Patriot acknowledged a problem with hemorrhoid OS and 32GB class 10 cards and suggested a temporary fix of performing a full format on a Windows PC with a 32kb allocation size, obviously FAT32 since stock hemorrhoid does not recognize NFTS.
The reply can be found in this review although the specific page will change if more reviews are added.

Thanks! I guess hemorrhoid OS is a real pain in the a** to work with.
Thanks! Its been a bad month so far. I really needed that laugh.
Motorola lied and I'm still locked mb865

Atrix 2 has been facing trouble when used a sd card of above class 6. I've a 32 gb class 10 card but i faced many problem when i used it last month then i had to replace it with 16gb class6 of kingston.
Sent from my MB865 using xda app-developers app

random or sequential ??
br0adband said:
Just for the record, the class rating is the write speed which is more relevant because you'll want to add content to the card; reads speeds on SD cards are typically - and I say "typically" because in testing over 200 different sizes and brands one time (took a full day to do it) the typical read speed was about the same across them all on average - about 17.5MB/s (that's Megabytes per second read speed).
The write speed is what drags things down when it comes to adding content to SD cards, so... the higher the write speed, the faster the card should be able to store the content you're feeding it.
Class speed = approximate sustained write speed so...
Class 2 = 2MB/s on average sustained
Class 4 = 4MB/s
Class 6, etc up to Class 10 at 10MB/s.
etc etc etc .
Click to expand...
Click to collapse
Have googled a lot on this and stuck on one thing now....
Class 2 cards are poor in sequential write but they are good in random writes while Class 10 cards are good in sequential writes but poor in random writes. The lower the class the better is the random write and poor is the sequential write; vice versa.
So what is more important to have an optimum speed on cell, random writes or sequential ??
I guess random it is. cause sequential writes are more often in large file writing.
Can someone put some light on this ? for applications and other little writing tasks class 2 will be good whereas for copying data from or to PC or shooting full HD videos I guess class10 would be good !!
However m not sure about Android memory usage. What is more important from OS point of view, Random or Sequential write ?

lparihar9 said:
Have googled a lot on this and stuck on one thing now....
Class 2 cards are poor in sequential write but they are good in random writes while Class 10 cards are good in sequential writes but poor in random writes. The lower the class the better is the random write and poor is the sequential write; vice versa.
So what is more important to have an optimum speed on cell, random writes or sequential ??
I guess random it is. cause sequential writes are more often in large file writing.
Can someone put some light on this ? for applications and other little writing tasks class 2 will be good whereas for copying data from or to PC or shooting full HD videos I guess class10 would be good !!
However m not sure about Android memory usage. What is more important from OS point of view, Random or Sequential write ?
Click to expand...
Click to collapse
You CANNOT run a class 10 card well in this phone. I recommend getting a class 6 card, or a class 4 card, and be done with it. Those are 100% known to work with the atrix 2 without issues. Don't worry too much about which is better for what, with this phone the class 4 and class 6 seem to work the best, and give decent performance. And yes it will take a long time to copy 16GB of music and movies to your SDcard from a computer as the writes for a class 4 or 6 are mediocre for that, but decnet when used for anything on the phone itself. Just be very careful about running apps on the SDcard with this phone, it can be touchy and lose the apps and data on reboot, even though it is still on the SDcard the phone will not know how to use them and the pointers to the android system may just be gone. Sometimes just reinstalling the app from he play store works and other times you have to format the card... that is the biggest issue with this phone, period.

Atrix 2 can only withstand Class 4.

Darell3 said:
Atrix 2 can only withstand Class 4.
Click to expand...
Click to collapse
That is not true. I have a class 6 32GB card that works perfect, and so do several others that own the atrix2.

[Q] Is 16 GB enough

Hey guys,
was wondering what you all think about 16GB as internal space being enough or not? The problem that I'm thinking of is that "/sdcard" will get mapped to the internal memory (and not the external SD Card), and a lot of apps just go there to write stuff. Things like downloads folder etc., which default to /sdcard/download and may fill up the 16GB partition very soon.
What are your experiences in this direction?
thanks

Personaly for me its far too litle ,cuz i have got a lot of differents app ,also 4K video and timeshift video eat unimaginable amount of space

I believe Lollipop will allow you to save app data to an external storage.

Well there's at least a decent amount of onboard memory. I got by with a 32gb card for the past 3 years. Just noe upgraded to 64gb heading into my Z3v. I really only use it for old pics (from phone to phone) and keeping my entire music library on me at all times, which is like 12 gbs.
It's nice to know I'll never be worrying for space.

abhinav.tella said:
I believe Lollipop will allow you to save app data to an external storage.
Click to expand...
Click to collapse
Even then, the difference of write/read speeds is massive between internal memory vs external SD card. I believe 32 GB should be the bare minimum for today's smartphones. Glad T Mobile thought so as well, at least for the Z3.

Artood2s said:
Even then, the difference of write/read speeds is massive between internal memory vs external SD card. I believe 32 GB should be the bare minimum for today's smartphones. Glad T Mobile thought so as well, at least for the Z3.
Click to expand...
Click to collapse
If you get a good card like the Samsung Pro or SandDisk Extreme you won't notice much difference (40-50 MB/s Writes). The internal flash (made by Samsung) is obviously faster due being soldered and more inter connects (like RAID).
Cheap cards like the Sandisk Ultra are slow.... (10-15MB/s Writes)

abhinav.tella said:
If you get a good card like the Samsung Pro or SandDisk Extreme you won't notice much difference (40-50 MB/s Writes). The internal flash (made by Samsung) is obviously faster due being soldered and more inter connects (like RAID).
Cheap cards like the Sandisk Ultra are slow.... (10-15MB/s Writes)
Click to expand...
Click to collapse
The internal memory is like 200+ MB/s, so there is still a BIG difference. Also, I don't believe the memory controller can read the full potential of the Pro and Extreme cards. I have a 64 GB Ultra (advertised at 48 MB/s read), and I only get about 39 MB/s read. I have read the same for the Note 4 in that it cannot use the full speed available from those cards.

Artood2s said:
The internal memory is like 200+ MB/s, so there is still a BIG difference. Also, I don't believe the memory controller can read the full potential of the Pro and Extreme cards. I have a 64 GB Ultra (advertised at 48 MB/s read), and I only get about 39 MB/s read. I have read the same for the Note 4 in that it cannot use the full speed available from those cards.
Click to expand...
Click to collapse
True on both points, the card controller max is like 40-50MB/s. What I meant was I don't think you will notice much difference because, for most apps it should be fast enough and caching is still generally in the internal card. Loading big games like Asphalt may load a little slower but in use, it should not be too bad. Internal is ~240/40(R/W) Max for the klmag2geac-b001 (16GB) and 240/60 (R/W) for the 32 GB version in the D6616.
The reads are not the problem as most ops are reads anyway, but its the writes which are really low ~15 MB/s max, hence the cost of the Extreme/PRO 35-40 MB/s.
Basically what I am saying is you are right but this is your best bet.
Here is the specifications for the internal NAND if you are interested:

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.)
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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.