Develop Bugs

Sandisk Ultra SDXC Card Problem - Confirmed

I have a Sandisk Ultra SDXC 64GB Class 10 UHS-1 Micro SD card in my T999 T-Mobile Galaxy S III phone.
The card has become "damaged" (Samsung's term). 4 times now. Please note that the card works fine on my Window 7 PC. This last time I formatted the card in the phone, put the card in the PC, copied a bunch of files to it (about 3GB) and then put the card back into the phone. And the phone said that the card might be damaged. I was sure to unmount the card before removing it.
I called T-Mobile tech support and they know nothing about it.
I called Sandisk and they said "There are known problems with Samsung Phones and Tablets and Sandisk Class 10 cards. Samsung is aware of this and working on it. Would you like us to replace your Class 10 UHS-1 card with a Class 6 card?"
I called Samsung tech support and they know nothing about it and are not setup to tell their engineers about issues. The only way to report an issue to engineering is via email.
Let's make a loud stink about this so Samsung/T-Mobile will fix it.
Follow up on original post:
I went out and purchased the recommended Sandisk 64 GB SDXC Class 6 memory card and the problems are exactly the same as with the Class 10 card.
The problem seems to appear when there is more that 4GB (I'm not sure if it is exactly the 4GB barrier or not) on the card the Galaxy S III has a problem mounting the card. Note that once the card has gone greater than 4 GB even deleting files to reduce it below 4 GB does not allow the card to be mounted.
On the class ten card I was able to successfully run the fsck -t exfat command on the card that Android would not mount. fsck returned no errors or problems found.
My testing is rather limited but I can say: The T-Mobile Galaxy S III (T999) does not work correctly with SanDisk Ultra 64 GB SDXC memory cards (class 6 or Class 10)
Please, let's spread this around so that maybe Samsung, T-Mobile and SanDisk will learn how to work together and solve the problem for the sake of their customers.
I put the new card in the phone and formatted it in the phone.

I don't quite understand how you got 2 crap microsd card, I'm using a Samsung ultra 32gb class 10 just fine, never had one problem mounting it never seen one error message. Sorry
Sent from my SGH-T999 using xda premium

achmedclaus said:
I don't quite understand how you got 2 crap microsd card, I'm using a Samsung ultra 32gb class 10 just fine, never had one problem mounting it never seen one error message. Sorry
Sent from my SGH-T999 using xda premium
Click to expand...
Click to collapse
I think it is a software problem with the 64 GB Micro SDXC Card.

I have a Sandisk Ultra SDXC 64GB Class 10 UHS-1 in my Galaxy SIII and have never had an issue. I had problems formatting the card in my PC, So i just threw it in the phone and formatted it there. It was formatted and I have loaded about 25gb of music, 5gb of pictures through Cheetah Sync without issue.

picachux said:
I have a Sandisk Ultra SDXC 64GB Class 10 UHS-1 in my Galaxy SIII and have never had an issue. I had problems formatting the card in my PC, So i just threw it in the phone and formatted it there. It was formatted and I have loaded about 25gb of music, 5gb of pictures through Cheetah Sync without issue.
Click to expand...
Click to collapse
Have you rebooted your phone or unmounted and remounted the card? That is when the problems occur.
I believe that there is a bug in the code the Samsung uses to check the card prior to mounting. They are doing more than just a simple
fsck -t exfat.
I tried a 32 GB SDHC Samsung Class 10 card with the exact same data that was on the 64GB SDXC card without any problems. It is my belief that there is a bug in exFAT code in the Galaxy S III.
Thanks for your comments.

I have only unmounted the card twice to kickstart the media scan after loading some music and I reboot my phone every 2 days or so.

ChitownWingMan said:
Have you rebooted your phone or unmounted and remounted the card? That is when the problems occur.
Click to expand...
Click to collapse
I've reboot my phone all the time—I don't have any problems. I don't mount/unmount very often, but just tried it now and everything appears to be fine.
My card is a 64 GB class 5 SanDisk, formatted FAT32 (done on a Linux machine).

tamasrepus said:
I've reboot my phone all the time—I don't have any problems. I don't mount/unmount very often, but just tried it now and everything appears to be fine.
My card is a 64 GB class 5 SanDisk, formatted FAT32 (done on a Linux machine).
Click to expand...
Click to collapse
I believe the bug is in the exFAT drivers in the S III.
I formatted the card in the S III under the mistaken assumption that the phone would know best.
The theoretical maximum size of FAT32 is 2TB. However, since Microsoft in their infinite wisdom decided only to support FAT32 up to 32GB (most likely to force people to use NTFS) support for FAT32 above 32GB is spotty and unreliable.
This being said if you format a 32GB card or smaller in the Galaxy S III, it will be formatted FAT32. If you format a 64GB (or greater I presume) in the Galaxy S III, it will be formatted exFAT.
I will try formatting the card as a 64GB FAT32 partition. However, this will mess up my using a USB 3.0 card reader (at 5Gb/S transfer rate) to write to the card. Writing to the card via WiFi is interminably slow by comparison.

Sounds like windows is damaging the exFAT partition when you plug it in to your computer to transfer stuff. I've never done that because I just use Cheetah Sync to sync my iTunes(25gb) folder to my sdxc card and to sync my pictures/videos from the sdxc to my pc.

ChitownWingMan said:
I believe the bug is in the exFAT drivers in the S III.
Click to expand...
Click to collapse
Seems that way to me too. exFAT is not in Linux upstream, so I imagine Samsung just bought a binary driver from someone. Who knows the quality.
I will try formatting the card as a 64GB FAT32 partition. However, this will mess up my using a USB 3.0 card reader (at 5Gb/S transfer rate) to write to the card. Writing to the card via WiFi is interminably slow by comparison.
Click to expand...
Click to collapse
What does the card reader have to do with it? I've a USB 3.0 card reader, and my 64 GB FAT32-formatted fine.
As I recommended in the other thread, use a Linux Live CD to format your SD card.

tamasrepus said:
Seems that way to me too. exFAT is not in Linux upstream, so I imagine Samsung just bought a binary driver from someone. Who knows the quality.
What does the card reader have to do with it? I've a USB 3.0 card reader, and my 64 GB FAT32-formatted fine.
As I recommended in the other thread, use a Linux Live CD to format your SD card.
Click to expand...
Click to collapse
or use Partition Wizard Home Edition (free)(windows) for large fat32 format jobs works perfectly and the price is right http://www.partitionwizard.com/free-partition-manager.html

picachux said:
Sounds like windows is damaging the exFAT partition when you plug it in to your computer to transfer stuff. I've never done that because I just use Cheetah Sync to sync my iTunes(25gb) folder to my sdxc card and to sync my pictures/videos from the sdxc to my pc.
Click to expand...
Click to collapse
Because I thought the same thing one of the tests that I performed was to never remove the card from the phone. I did all of my copying to and from the card via File Expert Web Sharing. One day I ran the phone battery down and the phone rebooted. When it came back up it was unable to verify the card. However, fsck -t exfat found no problems with the card.
One interesting point, I was using Cheetah Sync (a great program) last night to copy a TitaniumBackup directory to the phone and it failed. Here is a copy of the email I sent to the developer:
The destination directory contains 11,841 files totaling 2.93GB and Cheetah needs to download 1917 files and is failing on the 1st file with the error "Sync Error - I/O error downloading files.".
Note: Cheetah Sync had already copied almost 7,000 files. It originally failed during a copy of almost 9,000 files. I restarted
the sync and that is why it failed on 1 of 1,917 files.
I am using a T-Mobile Galaxy S III (Model SGH-T999) with 32 GB internal memory and a 32 GB external SD Card (Samsung Class 10).
The source directory is c:\phone\card_backup\TitaniumBackup and the destination directory is /mnt/extSdCard/TitaniumBackup.
I am able to manually create a file in that directory using a file explorer.

tamasrepus said:
Seems that way to me too. exFAT is not in Linux upstream, so I imagine Samsung just bought a binary driver from someone. Who knows the quality.
What does the card reader have to do with it? I've a USB 3.0 card reader, and my 64 GB FAT32-formatted fine.
As I recommended in the other thread, use a Linux Live CD to format your SD card.
Click to expand...
Click to collapse
The card reader is not the issue just the mechanism to allow me to copy files quickly from/to the card.
How Windows will handle a FAT32 partition greater than 32GB is my concern. In the past I have always used NTFS for drives/cards greater than 32GB because FAT32 has a 4GB - 1 file size limit and I have many video files that are larger then that.
MiniTool Partition Wizard and Easeus Partition Master can both also make a 64GB FAT32 partition.
Thanks...

Update
There is an update to this thread here:
http://forum.xda-developers.com/showpost.php?p=29904990&postcount=10

SanDisk Ultra 64GB microSDXC Class 10 Only $54.51

Found this really nice deal on Amazon.
Just ordered one
http://www.amazon.com/gp/aw/d/B007WTAJTO/ref=redir_mdp_mobile?redirect=true

I'd say be careful. If you check some reviews, I heard when they sell out, they replace it with Class 6.
Sent from my SGH-T999 using xda app-developers app

You don't have to worry if you buy from Amazon. If you buy from a third party make sure it says "fulfilled by Amazon", you'll get super saver shipping and it will be exactly as described.

It's Sold by Amazon and
Fulfilled by Amazon,
so I'm not too worried about it.
If they ship something other than what I ordered, I'll just return the item
I've always had good experiences with Amazon, as long as the Items are Sold by Amazon directly, or if the Seller's Return Policy is the same as Amazon's.
I read through All 12 pages of Amazon reviews.
This Is a Class 10 Card.
The 4th reviewer was only stating his opinion. Every Reviewer (111 of 112) received a Class 10.
And the 4th reviewer most likely also received a Class 10.

I'm actually using this card right now. Ordered it Saturday, got it Wednesday. Works like a champ.
From Amazon, of course. The price was cheaper than ebay, with none of the risk.

Bought this card last night...hope it works in a 16 GB verizon s3...

I would live to get one of these but I'm in Canada. Anyone want to order one for me?
Sent from my SGH-I747M using xda app-developers app

got this card today and it does not work...does anyone know if you need to do anything special?

bearklaws said:
got this card today and it does not work...does anyone know if you need to do anything special?
Click to expand...
Click to collapse
What ROM are you using? Did you format the card?

senergy rom, and yes i formated it. i also transferd from old card to new card and still a no go.
went into setting /then to storage and tried to mount it that way also. it might be bad.

bearklaws said:
senergy rom, and yes i formated it. i also transferd from old card to new card and still a no go.
went into setting /then to storage and tried to mount it that way also. it might be bad.
Click to expand...
Click to collapse
I can't see pics at work if you uploaded a pic with that, but does your computer read it? Does your phone say its corrupt? If everything says it's corrupt you can probably go to control panel -> hardware and do a full format (25/30 minutes). If nothing recognizes it at all, it's bad and you should request a replacement/refund.

had a hard time formatting the very first time. I am going to do a full format now, if that doesnt work, its going back. Thanks for the help.
Tried everything i know how...i am sending it back...thanks

Just received mine, and installed it in my S3.
Working Perfectly
This is what I did:
- I removed my SanDisk 32GB Class 6 card from my S3 after 'Unmounting' it.
- I saved All data on the card to a Folder on my pc
*the 32GB card is FAT32
- I installed the 64GB card into my S3, Formatted it, and Removed it after 'Unmounting' the card.
I transferrerd All data onto my New 64GB Card via my pc
- I installed the 64GB card into my S3 and Everything is Working Fine
*the 64GB card is exFAT
The 64GB card had 59.47GB Usable memory beforing transferring my folders over to it.

Biker1 said:
Just received mine, and installed it in my S3.
Working Perfectly
This is what I did:
- I removed my SanDisk 32GB Class 6 card from my S3 after 'Unmounting' it.
- I saved All data on the card to a Folder on my pc
*the 32GB card is FAT32
- I installed the 64GB card into my S3, Formatted it, and Removed it after 'Unmounting' the card.
I transferrerd All data onto my New 64GB Card via my pc
- I installed the 64GB card into my S3 and Everything is Working Fine
*the 64GB card is exFAT
The 64GB card had 59.47GB Usable memory beforing transferring my folders over to it.
Click to expand...
Click to collapse
Nice...I could not even get my phone to see it...I did the same thing you did also...just a bad card,waiting for another.(thanks for the write up.)

bearklaws said:
Nice...I could not even get my phone to see it...I did the same thing you did also...just a bad card,waiting for another.(thanks for the write up.)
Click to expand...
Click to collapse
Your card arrived in the cardboard/blister packaging?
Don't know what the odds are of getting a defective card, taking into consideration the Seller, packaging, etc. But hopefully your replacement card will have no issue.
Have you tried to install the card into another device, if one is available?

Biker1 said:
Just received mine, and installed it in my S3.
Working Perfectly
This is what I did:
- I removed my SanDisk 32GB Class 6 card from my S3 after 'Unmounting' it.
- I saved All data on the card to a Folder on my pc
*the 32GB card is FAT32
- I installed the 64GB card into my S3, Formatted it, and Removed it after 'Unmounting' the card.
I transferrerd All data onto my New 64GB Card via my pc
- I installed the 64GB card into my S3 and Everything is Working Fine
*the 64GB card is exFAT
The 64GB card had 59.47GB Usable memory beforing transferring my folders over to it.
Click to expand...
Click to collapse
+1
I did exactly the same (my old 32GB FAT32 card to new 64GB exFAT one).
And everything is going fine...
Sent from Tapatalk 2

key_r said:
+1
I did exactly the same (my old 32GB FAT32 card to new 64GB exFAT one).
And everything is going fine...
Sent from Tapatalk 2
Click to expand...
Click to collapse
Sounds good to me
My S3 now has a capacity for 96GB of frigg'n
memory
That's a lot of memory!

does a 64gb card HAVE to be exfat? or can i make it fat32?

diz_dizane said:
does a 64gb card HAVE to be exfat? or can i make it fat32?
Click to expand...
Click to collapse
You can but you can't format it using the Windows formatter. I used easeus software to format mine so that the card would be visible in clockwork recovery. exFAT is not supported there. Had a bit of a scare after formatting with the HP utility. Repartitioned in easeus but it would only read on the computer and it would FC system apps on my phone. Figured out that the partition needs to be primary not logical (what easus defaults to for new partitions) to work on the phone. All you have to do is pop the card in the computer, open easeus and format fat32. Don't mess with partitions
Sent from my SPH-L710 using Tapatalk 2

nacron said:
You can but you can't format it using the Windows formatter. I used easeus software to format mine so that the card would be visible in clockwork recovery. exFAT is not supported there. Had a bit of a scare after formatting with the HP utility. Repartitioned in easeus but it would only read on the computer and it would FC system apps on my phone. Figured out that the partition needs to be primary not logical (what easus defaults to for new partitions) to work on the phone. All you have to do is pop the card in the computer, open easeus and format fat32. Don't mess with partitions
Sent from my SPH-L710 using Tapatalk 2
Click to expand...
Click to collapse
I didn't realize that Clockwork didn't read exFAT.
I just did a backup to my Internal storage cause as you say, CWM didn't see the ext. SD card.
I'm gonna reformat the card now.
Thanks.
Is this what I need to use to convert to FAT32?
http://en.kioskea.net/download/download-380-easeus-partition-master
I'm going to do the following:
- format 64GB card in my S3, which will delete all data
- install Easeus onto my pc
- put 64GB card into my pc
- open Easeus Utility, and format 64GB card to FAT32.
- reinstall Folders previously saved on my pc from my 32GB FAT32 card to the newly formatted 64GB card
- install card into my S3, and I should be good to go?
UPDATE:
- Formatted 64GB card to FAT32
- CWM recognizes card
All is well in the neighborhood

SD Card Issues

I have been having problems switching from a 4gb sd card to a 32gb sd card in my htc one v. The 4 gig runs perfectly fine in my phone but I need more space so I switched to the 32gb card.
The problem I am having is almost instantly after putting in the 32gb card my phone starts lagging on just about everything. Load times take longer, the phone has more graphical glitches etc. I tried formatting the card to nfts and running paragon software to use that file type. Still no hope. I also partitioned the card to 16gb and free space for the other half and still no luck really. Though I did see some improvement.
Is it just that I got a bad sd card? Note that it works with my laptop and also in my pc perfectly fine, the phone just seems to not like the card or larger file size. Has anyone else gotten a 32gb sd card to work in their htc one v?
Thanks
Derek

Yes my 32 gb transcend class 4 works perfectly,no lags,try formatting it with fat32 with the help of your pc like I told you once before.

mihirengg19 said:
Yes my 32 gb transcend class 4 works perfectly,no lags,try formatting it with fat32 with the help of your pc like I told you once before.
Click to expand...
Click to collapse
I have an ADATA 32gb class 10 card. I will try that
Edit: Ever since I tried partitioning the sd card with MiniTool Partition Wizard the card won't show up on my pc. The software says that it is a (Bad Disk). Note that I can use the card perfectly fine on my macbook pro and the phone also recognizes the card. If I put the card into my phone and connect with USB it works fine.

Sd Card?

Which 32 gb 10 class for ZL? Samsung , sandisk , sony, transcend or which? Need to buy one soon.

samsung or sandisk both are good. Just so you know the 64gb sandisk works in our ZL's

i know 64 gb works but it's too costly for me so i am going with 32gb.

juct check my sig, im using 32GB UHS1 from sandisk and work well.

Me too. Iam abt to buy a card. But im scared that the card might get corrupted. Is dat corruption problem common in ZL too?? or only in Z?
So iam thinking of buying a Sony micro sd presuming it will not get get toasted!
So tell me a brand less prone to corruption
Thanks

control freak said:
Me too. Iam abt to buy a card. But im scared that the card might get corrupted. Is dat corruption problem common in ZL too?? or only in Z?
So iam thinking of buying a Sony micro sd presuming it will not get get toasted!
So tell me a brand less prone to corruption
Thanks
Click to expand...
Click to collapse
Just get a 64GB sandisk and you're all good.

bodson66 said:
Just get a 64GB sandisk and you're all good.
Click to expand...
Click to collapse
I concur. I've been using a 64GB sandisk since I got my ZL at the beginning of May. No problems here.

FranzDages said:
I concur. I've been using a 64GB sandisk since I got my ZL at the beginning of May. No problems here.
Click to expand...
Click to collapse
what extension do you use ? exFat or ...
do you using foldermount or directory bind ?
im using 4.2.2 and sometime my card rejected itself.

kickthefreak said:
what extension do you use ? exFat or ...
do you using foldermount or directory bind ?
im using 4.2.2 and sometime my card rejected itself.
Click to expand...
Click to collapse
When I got the phone, I just reformatted it using the phone. I never even looked in to what extension it's using. This was on 4.1.2, and it read it as 64GB then, though I believe the new update says it NOW allows 64GB. I just copied the card onto my computer, reformatted the card, and then put everything back on it. No problems up to this point, though I've only been using 4.2.2 for a few days.

I just picked up a 32gb Sandisk Ultra UHS-1 for it. (64gb was pretty spendy and far more than I really needed) I hope this was a good choice on my part, but judging by the comments it should be fine. I should have my Xperia ZL on Wednesday and will report back how it works out. (Just ordered it, got free overnight shipping)

I am using SanDisk 32 GB UHS-1. Just reformatted it with phone to see, what file system is used with new firmware. It is formatted in FAT32 by default. No problems so far.
Sent from my C6503 using xda premium

So I finally brought a 32GB SanDisk ultra uhs 1 class 10 today. I just hope it doesnt fry
Also, is there any option to format the card on the phone?? if not then do I need to format the card on pc? Which format should I use? ExFaT or FAT 32?
Thanks for ur help..

control freak said:
So I finally brought a 32GB SanDisk ultra uhs 1 class 10 today. I just hope it doesnt fry
Also, is there any option to format the card on the phone?? if not then do I need to format the card on pc? Which format should I use? ExFaT or FAT 32?
Thanks for ur help..
Click to expand...
Click to collapse
i read many post on several posting, they use exFat format,
but for me, i dont know what my card format because my card is formatted by phone.

kickthefreak said:
i read many post on several posting, they use exFat format,
but for me, i dont know what my card format because my card is formatted by phone.
Click to expand...
Click to collapse
That's what I want to know, how do u format the card on the phone?

control freak said:
That's what I want to know, how do u format the card on the phone?
Click to expand...
Click to collapse
its shown when i put my sdcard in the phone and shown notification i need to format the card by phone, thats it :laugh:
but first i format my card on computer with ntfs format.

kickthefreak said:
its shown when i put my sdcard in the phone and shown notification i need to format the card by phone, thats it :laugh:
but first i format my card on computer with ntfs format.
Click to expand...
Click to collapse
ay... But I didnt get a notification when I put the card in.
Actually, I just opened the card packaging and inserted directly into my phone anyways, thanks

control freak said:
So I finally brought a 32GB SanDisk ultra uhs 1 class 10 today. I just hope it doesnt fry
Also, is there any option to format the card on the phone?? if not then do I need to format the card on pc? Which format should I use? ExFaT or FAT 32?
Thanks for ur help..
Click to expand...
Click to collapse
even i am using that, just insert and your good. am using us 16GB wifi.
edit > sorry i thot this was XTZ forum

It Works!!
Bought Sandisk 32GB 10 class 1-2weeks ago and it's working without any problem. :good:

Whatever you do, be wary of corrupt/mislabeled SD cards!
When you get your SD Card, always first check it out with a tool like H2testw or Check Flash and make sure that the reported size (32GB, 64GB) is indeed the actual storage capacity.
I once bought a 16GB flash drive that could only store 8GB of data; exceeding this 8GB would corrupt the data on the drive. H2testw proved that cheap deals online usually come with a price...

[Q] P601 64GB sdcard unwritable

Hi folks,
I recently got a 64 GB microsd card ( class 4) for my galaxy note 10.1 SM-P601 ( build:JSS15J.P601XXUBMJ9,Baseband601DDUBMJ1).
This card works fine when I use it on my laptop but I am unable to write it on the tablet.I am able to read the data though.
Below is the list of what I have already tried and failed.
1)I have tried rebooting,remounting reinserting
2) As the default format was exFAT I reformatted it into fat32 using fat32 formatter.
3) I tried partitioning the card on laptop into 2 32gb partitions and then using it on the tablet.
4) I have tried SD card accelerators from Play store.
Once I mount the sdcard it shows TOTAL SPACE: 62.5 GB in Settings->General->Storage.When ever I try to write the card it somewhat gets unmounted and shows TOTAL SPACE :0.0 bytes.
Please suggest a solution to make it work

maainux said:
Hi folks,
I recently got a 64 GB microsd card ( class 4) for my galaxy note 10.1 SM-P601 ( build:JSS15J.P601XXUBMJ9,Baseband601DDUBMJ1).
This card works fine when I use it on my laptop but I am unable to write it on the tablet.I am able to read the data though.
Below is the list of what I have already tried and failed.
1)I have tried rebooting,remounting reinserting
2) As the default format was exFAT I reformatted it into fat32 using fat32 formatter.
3) I tried partitioning the card on laptop into 2 32gb partitions and then using it on the tablet.
4) I have tried SD card accelerators from Play store.
Once I mount the sdcard it shows TOTAL SPACE: 62.5 GB in Settings->General->Storage.When ever I try to write the card it somewhat gets unmounted and shows TOTAL SPACE :0.0 bytes.
Please suggest a solution to make it work
Click to expand...
Click to collapse
Have you formated it in the GN 2014?
Also, I wouldn't use a Class 4.. Just my opinion.
Also, they have some bad 64gb cards out there.. I would get a name brand 64gb class 10 from BestBuy, Staples, etc.. Format it GN 2014. If everything works, then the problem was the sd card.
I have a Sandisk Ultra 64gb Class 10 in my GN 2014 and my Note 3.. both work perfectly.

Hi gurus,
The Idea is to make the the 64 gb card (that working fine on my laptop) work on my note 10.1.
Please help .
What could be the possible reason.

maainux said:
Hi gurus,
The Idea is to make the the 64 gb card (that working fine on my laptop) work on my note 10.1.
Please help .
What could be the possible reason.
Click to expand...
Click to collapse
As you have tried several things, can you please tell us exactly what your situation is now so we can help you.

If the card is a used one, it may have been formatted as FAT32, to work in a non-Sdxc compatible device. The Sdxc capable note may boycott the card because of violation of the specs, so reformat it to exFat.
It was similar with 4GB SD cards, which shall not exist by spec, but worked fine in Sd devices, not in Sdhc ones.

Experiencing the same
maainux said:
Hi folks,
I recently got a 64 GB microsd card ( class 4) for my galaxy note 10.1 SM-P601 ( build:JSS15J.P601XXUBMJ9,Baseband601DDUBMJ1).
This card works fine when I use it on my laptop but I am unable to write it on the tablet.I am able to read the data though.
Below is the list of what I have already tried and failed.
1)I have tried rebooting,remounting reinserting
2) As the default format was exFAT I reformatted it into fat32 using fat32 formatter.
3) I tried partitioning the card on laptop into 2 32gb partitions and then using it on the tablet.
4) I have tried SD card accelerators from Play store.
Once I mount the sdcard it shows TOTAL SPACE: 62.5 GB in Settings->General->Storage.When ever I try to write the card it somewhat gets unmounted and shows TOTAL SPACE :0.0 bytes.
Please suggest a solution to make it work
Click to expand...
Click to collapse
Hi maainux, I'm experiencing the same problem here, have you found any solution?
Mine is a SM-P601 / Android 4.3 / Build: JSS15J.P601UBUBMJ4 / Baseband: P601UBUBMJ1 (Fully Stock)
I tried 3 64gb micro sd card: SanDisk Ultra, Samsung, and a generic one. For both 3 the same results, as following:
1 - If I let the tablet format the card (exFAT), it can be mounted but gets suddenly unmounted when I try to write on it and shows TOTAL SPACE :0.0 bytes just like yours. I installed BTSync, when I tried to configure the sync on the tabled by selecting the sd card as the destination folder for the files, the app give a message saying it don't have permission to access that folder and gets unmounted. Tried rebooting, remounting, reinserting, and nothing change.
2 - If I format to fat32 as a logical partition using Minitool Partition Wizard, I get the same behavior as above description.
3 - If I format to fat32 as a primary partition using Minitool Partition Wizard, I can create folders but can't delete them, when I try to delete via "My Files" it says "deletion failed". I tried ES File Explorer, get the same. I was able to configure BTSync, it can copy the files from my PC folder, but when I delete some file in the PC it can't be deleted on the tablet and the BTSync app shows a message stating it can't identify the destination folder on the tablet.
I have some micro sd cards laying around, tried SanDisk 32gb, 16gb and 8gb, both 3 worked flawlessly on the tablet. I noticed the tablet format any <32gb card as fat32, and the 64gb as exFat, this make me think that was related to file system format, but it's not. Seems something related to permissions, like the KitKat 4.4 guys are experiencing. The point is I'm completely newbie on Android and have ZERO knowledge on Linux/Unix, so I have no Idea on how to solve this.
Can you guys help me?
Thanks in advance.

Hi guys
have you found any solution?
Thanks