Database Users

32gb Micro SDHC woes

Hi all,
Apologies for the rambling post below but....
I would like to report major problems I have experienced with 32gb Micro SD cards with a number of Android devices, and most recently my new Desire HD.
The problems occur when I copy across my music library to the 32gb SD. It is a mixture of MP3 and AAC (mp4) files and the initial amount of data is a minimum of 5gb. All the data copies across fine, as I can tell from the available space under settings/SD & phone storage. However, the stock music player app does not recognise roughly half the music, and some of the music it has recognised produces a "cannot play this file format" message if i try and listen to it.
Using Astro File Manager, I then browse to the location on the SD card where I have copied the music and find that the music (that was not recognised) , is not physically on the SD card (despite the available space remaining suggesting the files are there).
If I then copy new music to the Desire HD on the SD card, the music copies over but the same scenario above occurs.
If I keep the SD card in the phone for 24 hrs the phone will crash numerous times and the only way I can turn the phone back on is to remove the battery.
I have tested 4 different 32gb Micro SDHC cards, 2 Class 4 SanDisks and 2 Class 6 Kingstons, same results with both.
Phone-wise, I have tested this on an HTC Wildfire and Samsung Galaxy S (running Android 2.1) and an HTC Desire and HTC Desire HD (running 2.2). I will test on a Samsung Galaxy Tab tonight.
Also, I have tested the above after formatting the SD card in the devices themselves, and from formatting the SD card from Windows 7 using FAT32 and 32kilobytes as the allocation unit size.
Has anyone else experiences issues with 32gb Micro SDHC cards? FYI, the stock 8gb Samsung SD card that comes with the Desire HD works without any issues whatsoever.
regards
Michael

I'm so glad you've posted these findings, I was contemplating buying a 32GB microsd card but could not justify paying more than twice the amount it costs for a 16GB card. I think I'm going to settle with a 16GB card now.
EDIT:-
Just thought about something, where are you doing this from, Windows 7 ? There is a Microsoft Windows update that fixes a problem with Windows 7 not reading 32GB or higher memory cards properly.
h t t p : / / support.microsoft.com/?kbid=976422

Very interesting and useful info for who tend to use 32GB microsd with DHD.
Is there anyone using 32 GB without any problem? We need to find out if DHD has a common problem with 32 GB or not.

eozen81 said:
Very interesting and useful info for who tend to use 32GB microsd with DHD.
Is there anyone using 32 GB without any problem? We need to find out if DHD has a common problem with 32 GB or not.
Click to expand...
Click to collapse
I have one I got last week thats working perfect! 32GB class 4 from mymemory.co.uk (their own card, no manufacturer name).
I've copied a bunch of music and some HDTV episodes onto it so it's almost full, all files are definitely there and I've had no issues with playback. Using Astro too.
Copied them over on a Windows 7 system with Android Manager WiFi, I've used the regular USB cable once or twice which works fine too.

I also have a 32gig card.
Initially I had similar problems to you bit sure what fixed it, HTC sync works and I did reboot one or twice, but its all working
Sent from my Desire HD using XDA App

No issues with my Integral 32GB Class 4 card.

Try formatting with 32k cluster size...I've read that it helps with stuttering video issue, maybe it also helps with this...

Then nice to know it's a spesific problem not common. Thanks for the feedbacks guys.

I'm having exactly same problems as post 1. Someone suggested it might be a fake 32GB card so I'm currently running h2testw on it to see.

doogs20 said:
I'm having exactly same problems as post 1. Someone suggested it might be a fake 32GB card so I'm currently running h2testw on it to see.
Click to expand...
Click to collapse
That was the case with my 32GB one. h2testw reported only the first 1.8GB usable.
I suspect these are factory rejects being snatched before being destroyed/recycled.

I've been using a Kingston Class 4 32Gb card for 2-3 months now with absolutely no problems. Almost full of music and Sat Nav maps, and not even a hint of problems. Make sure you buy from a reputable, or at least traceable, supplier!

Sounds like the card is faulty or fake, ALWAYS test with H2TESTW and format it with Panasonic's SD Formatter app BEFORE using it with any device! Too many dodgey cards out there!
Sent from my Desire HD using XDA App

Mind if I ask where the hell did you find 32GB class 6 Kingston or other cards.
I can't find anything higher than class 4. Also on their official page there aren't any 32gb microSDHC class 6+.

Ho everybody this is the answer. I have bought over 10 32gb micro SD cards from eBay and amazon.
Some would not even format. Dome would format but while trying to transfer the files half way through the card would fail and would not be able to format or only see the card as 8gb.
Some would format and transfer would be good but by the time I would check for the data on the card the data would have disappeared.
Let me make one thing clear ALL THESE CARDS WERE CHEAP NOCK OFFS AND CHEAP QUALITY FROM CHINA.
I payed from £25 to £80 from eBay and amazon and they all failed.
I bought ONE FROM SCAN.CO.UK and it worked first time and still works with no issues thank God.
IT IS NOT THE DHD IT IS THE CARDS.
The reason they all failed and why its so hard to believe is because not everyone that buys the cards would transfer so much data at the beginning which is why the card failed, the huge amount of data being transferred showed the true defects in the card.
I really hope this helped.
Kind regards
Imran
Sent from my Desire HD using Tapatalk

thanks guys for this discussion it really helped me as i was planing on buying one such card from ebay now would prefer a more reliable vendor and would read more reviews.

I've had a Lexar class 10 32GB I got from Amazon for £70 - works really well. Took a bit longer to 'prepare' when I first put it in, but no problems since.

Ordered my Focus!!! - Micro SDHC Question

I ordered the Samsung Focus with Amazon Wireless for one penny and a two year contract with AT&T! Couldn't be any happier with that.
Anyway, I ordered a case:
http://www.amazon.com/gp/product/B00495YF8A/ref=oss_product
And a screen protector (I know it's tough to scratch but eh, why not. Lol)
http://www.amazon.com/gp/product/B003F8C1GK/ref=oss_product
So I've been thinking about how much memory is on the phone. 8GB is nice but I will want to put a few of my 720P movies onto the Focus. I figured I could get 8B Micro SDHC (Class 10) and it would make it, 16GB. That's pretty decent, right? I think it will hold me over... Lol.
I did some research and I get the higher the class, the higher the write speeds. Right?
Well, what do ya'll think of this one?
http://www.newegg.com/Product/Product.aspx?Item=N82E16820220493
Thanks in advance everyone!!!

8gb is good enough for me....for now! Ill be buying a 16gb card soon enough tho because everytime you change the sd card you have to do a full reset on your phone, so id rather just do it now and get it all over with. So, what im trying to tell you is just get yourself a 16gb card if you going to be adding 720p movies...that way you wont really need to worry about changing the card later. As for the class...class 10 is unnecessary....class 2 has been proven to be VERY sufficient in the focus...even class 4. I had a class 6 and now I have a class 2 and there is NO difference in performance on my focus. Anyways, as for sd cards, be careful because some aren't working properly....I would say your safest bet is buying Sandisk...since thats what Samsung is using in the focus for memory right now.
Hope this helps!

Mr Patchy Patch said:
8gb is good enough for me....for now! Ill be buying a 16gb card soon enough tho because everytime you change the sd card you have to do a full reset on your phone, so id rather just do it now and get it all over with. So, what im trying to tell you is just get yourself a 16gb card if you going to be adding 720p movies...that way you wont really need to worry about changing the card later. As for the class...class 10 is unnecessary....class 2 has been proven to be VERY sufficient in the focus...even class 4. I had a class 6 and now I have a class 2 and there is NO difference in performance on my focus. Anyways, as for sd cards, be careful because some aren't working properly....I would say your safest bet is buying Sandisk...since thats what Samsung is using in the focus for memory right now.
Hope this helps!
Click to expand...
Click to collapse
Well, if I put a 720P movie on there, I'll just delete it once I'm finished watching it. Not going to have more than a few gigs of music too. So 8GB is good for me. Obviously once you put a movie on there you can delete it and get your memory back, correct? Sounds nooby but just double checkin... Lol. The higher the class the faster it gets on the card, right?

sd card
i got a sandisk 16g class 4 from radio shack cost about $34, had it in since two weeks before christmas.... loaded it almost full, empted most of it out loaded and unloaded stuff, havn't had any problems so far....... been running strong and just as fast as without the card...

xThe Enforcer said:
Well, if I put a 720P movie on there, I'll just delete it once I'm finished watching it. Not going to have more than a few gigs of music too. So 8GB is good for me. Obviously once you put a movie on there you can delete it and get your memory back, correct? Sounds nooby but just double checkin... Lol. The higher the class the faster it gets on the card, right?
Click to expand...
Click to collapse
correct...once you delete things you get your space back. I didn't notice much difference in transfer speed between my class 6 and class 2. So if you can, just save yourself the money and get class 4. There was an article I read somewhere that a higher class can actually make performance worse on the phone. Don't know how true it is, but class 2 has been perfect for me. No difference anywhere.

You need too spend some time reading this thread before buying a microsd card:
http://forum.xda-developers.com/showthread.php?t=834144&page=3
Determining whether an SD card is Windows Phone 7 compliant is not a simple matter of judging its speed class. Several other factors, such as the number of random read/write operations per second, play a role in determining how well an SD card performs with Windows Phone 7 devices.
Click to expand...
Click to collapse
http://support.microsoft.com/kb/2450831
A higher speed class can actually work against you because sometimes the maker sacrifices random operations for speed.
You can either wait for official "windows phone 7 certified" cards or take your chances. Read the first post carefully, especially the most recent posts. I personally have been using a 16gb Samsung card with no problems. Caveat emptor.

Sweet, thanks for the info.
This one looks promising...
Patriot Signature 16GB Micro SDHC Class 4 Flash Card Model PSF16GMCSDHC43P
http://www.newegg.com/Product/Product.aspx?Item=N82E16820220524
If you read the feedback, nothing but positive reviews.
"Pros: Very good price to performance ratio. Works with the Samsung Focus. Good read write speeds.
Cons: None
Other Thoughts: Not sure why some say negatives about the speed of the card. Maybe they got a bad one, but this tested out at just under 4.5gb write speeds. I had been using a Sandisk class 2 card with my Samsung Focus, but it would do some random rebooting and crashing. With this card it has been absoulutly perfect for over a week of use. I have 15gb of music and photos on the phone so I know that I am using the memory card along with the 8gb that is onboard with the phone."
Kinda sold on this... Should I do it?!?!?!?! Buy it right now?!?!! lol

This is pretty much what I was asking in another thread. I want to go with a 32GB card as I don't want to go through hard reset if I ever need more memory later on.
What is a good 32GB tmicroSD card hat works with Focus with no issues? I would like name of manufacturer, class and even the part# so I can source locally (go to store or order online).
Thanks.

No lie, you're going to spend a lot of $ and 32GB is overkill.

PaullikesWINMO said:
This is pretty much what I was asking in another thread. I want to go with a 32GB card as I don't want to go through hard reset if I ever need more memory later on.
What is a good 32GB tmicroSD card hat works with Focus with no issues? I would like name of manufacturer, class and even the part# so I can source locally (go to store or order online).
Thanks.
Click to expand...
Click to collapse
like I said before class 2 or 4 and Sandisk would be your safest bet.

smuook said:
You need too spend some time reading this thread before buying a microsd card:
http://forum.xda-developers.com/showthread.php?t=834144&page=3
http://support.microsoft.com/kb/2450831
A higher speed class can actually work against you because sometimes the maker sacrifices random operations for speed.
You can either wait for official "windows phone 7 certified" cards or take your chances. Read the first post carefully, especially the most recent posts. I personally have been using a 16gb Samsung card with no problems. Caveat emptor.
Click to expand...
Click to collapse
thank you for posting that.

Cool, will do. Thanks

Might one of you be able to supply the MFG Part# of the working 32GB microSD cards you have ?

Patriot 16GB Class 4 working PERFECTLY!!!

Mr Patchy Patch said:
like I said before class 2 or 4 and Sandisk would be your safest bet.
Click to expand...
Click to collapse
No sANDISK 16 GB class 2, THAT doesnt work, read the thread before you advise

jaraya13 said:
No sANDISK 16 GB class 2, THAT doesnt work, read the thread before you advise
Click to expand...
Click to collapse
you dumbass! I've been using that for about 2 weeks now without problems....dont tell me it doesn't work!!!

Mr Patchy Patch said:
you dumbass! I've been using that for about 2 weeks now without problems....dont tell me it doesn't work!!!
Click to expand...
Click to collapse
LOL, 2 weeks, that's a lifetime. I am so going to laugh when it starts giving you troubles.
I see you have never read the whole thread: http://forum.xda-developers.com/showthread.php?t=834144&goto=newpost
In that thread you'll see that around 7 guys with that MicroSD had multiple problems with that card, including myself.
Good luck with that L!

Mr Patchy Patch said:
you dumbass! I've been using that for about 2 weeks now without problems....dont tell me it doesn't work!!!
Click to expand...
Click to collapse
After reading the large thread on compatible cards above, it seems the real test is if you've loaded over 8GB of data onto the SDHC card (or over 16GB total in your case) and don't experience any problems. If that's the case then that's awesome (and it also sadly verifies the fact that no one knows which brand of card really works than the Sandisk 8GB Class 2, which is mentioned in the official instruction manual).
To the OP, I've stuck with the 8GB Sandisk. I considered the OEM version for $12 USD available on Amazon but decided against it, and went with the retail packaged version, which I got at Radio Shack for $20 USD. 14 or so GB will be good enough until the official certified ones are announced.

well ill just refer to him as mr arse... but mr arse is partially correct.... mine was stable up to 15gb then after that it went downhill fast.... so give the dude a bit of a break....

Has anyone seen any OFFICIAL announcement that there will be APPROVED cards for WP7. I know that Sandisk tried to pull a fast one and say their's were approved but then pulled them. Is MS even allowing such a program?

Using 64 GB SD

Does anyone has trying to use a 64 SD in the note ? I had tried a Samsung without any luck. It can be read and also save some music and videos but after using 5 GB it start failing.

Yes
I use Samsung 64Gb MicroSD without any problem

I am using a SanDisk Extreme Plus 64gb MicroSD card in my Note Pro. Works great, no complaints.

No problems here either. Look like a bad card maybe. I would try it in a PC to see if you get the same results. If so then it's probably a bad card. There are counterfeit cards out there that also give the results you have.

I agree, a defective card. I'm using a 128 GB card bought from a chinese retailer for 30 € and no problem so far.

I use a 64gb microSD. The first one I tried only lasted a few weeks and then I started getting errors. I replaced the card and all was well for about 6 months. Then I started getting errors saying the card was corrupt whenever the battery would drop below 50% state of charge. I finally sent the tablet in for repair (under warranty). They told me there was a battery terminal connection that was broken and they also update "software". Not sure what that was since I was already on the latest update. The only thing I can figure is it was some form of firmware update. When I got it back it seemed to fine and I have not had a problem in the last few weeks since it was returned.
Sent from my SM-P900 using Tapatalk

I'm using the 64GB Sandisk Extreme Plus, total space 59,45GB, Available space 1,25GB, Used space 58,20GB. It contains films, series, music, magazines(pds), portfolio photo's and ebooks.
I can copy, paste and move to and from it. Only thing that doesn't work is renaming. Never had any errors, never had any issues with it. It's been in use since I bought it on 28th July.

treetopsranch said:
No problems here either. Look like a bad card maybe. I would try it in a PC to see if you get the same results. If so then it's probably a bad card. There are counterfeit cards out there that also give the results you have.
Click to expand...
Click to collapse
Yes it could be a counterfeit card.

ShadowLea said:
I'm using the 64GB Sandisk Extreme Plus, total space 59,45GB, Available space 1,25GB, Used space 58,20GB. It contains films, series, music, magazines(pds), portfolio photo's and ebooks.
I can copy, paste and move to and from it. Only thing that doesn't work is renaming. Never had any errors, never had any issues with it. It's been in use since I bought it on 28th July.
Click to expand...
Click to collapse
Where did you buy it? Please?

64Gb from Samsung that was delivered with a promo-action from Samsung works like a charm

jfavellanedab said:
Where did you buy it? Please?
Click to expand...
Click to collapse
Media Markt in Dorsten, Germany.

Amazon
sandisk 64G Extreme (U3) =45 Euro

Micro Sd card issue.

Got my v20 yesterday but its mot reading my 128 gb micro sd card . guess I'm going to have to format but transfer all my files to computer first . can't loose I have a lot . The card is SDXC .
$oul€$$ D€m0n!

Thanks for sharing.

You forgot to disclose the manufacturer and model of the card. Havent had a problem with any micro's in my v20.

It's a Samsung SDXC
$oul€$$ D€m0n!

Im having issues with sd card with camera saving to sd card. Also when i crop a photo it won't save. Using my 256 card from my Note 7 that cane with phone. Never had a issue on the Note, with the V20 km.about to just use it for the DAC only n go back to Note 5. Permissions in Google have been charged to give permission but still cant saved edited photos

I recently had a Samsung sdxc evo class 10 fail (suddenly couldn't write anything despite having 80gb of free space left).
Did manage to copy the data off of the card but I ended up having to get a new card, this time I went with SanDisk class 10. So far so good.
Wonder if there is a defective batch going around (I purchased mine about a year ago)
Sent from my LG-H901 using XDA-Developers mobile app

I have the same card from Samsung,( it was free with the Note 7). Unfortunately, I'm still having problems playing videos. I've tried VLC and MX, but both only play some of the files from SD. Any suggestions would be greatly appreciated.

Definitely have to format. If you'll notice the card is assigned I don't know what to call it and filesystem may have been handled differently. I had to do same. Took time but works proper.

Deleted.

evo4g63t said:
I recently had a Samsung sdxc evo class 10 fail (suddenly couldn't write anything despite having 80gb of free space left).
Did manage to copy the data off of the card but I ended up having to get a new card, this time I went with SanDisk class 10. So far so good.
Wonder if there is a defective batch going around (I purchased mine about a year ago)
Sent from my LG-H901 using XDA-Developers mobile app
Click to expand...
Click to collapse
Same thing happened to me, 128gb card bought about a year ago. I had to buy a new one.
This new one has been "corrupted" twice now to where I had to format it.

Thanks for sharing. But none of those is related to my issue. My card isnt corrupted. My v20 just wint read it but when I put it back in the v10 all is fine also my computer reads it. But the v20 dosent even see external storage that is my issue
$oul€$$ D€m0n!

diamantericos said:
Thanks for sharing. But none of those is related to my issue. My card isnt corrupted. My v20 just wint read it but when I put it back in the v10 all is fine also my computer reads it. But the v20 dosent even see external storage that is my issue
$oul€$$ D€m0n!
Click to expand...
Click to collapse
Sounds like it may be a hardware issue.
Sent from my LG-H918 using XDA Premium HD app

Intub8 said:
Sounds like it may be a hardware issue.
Sent from my LG-H918 using XDA Premium HD app
Click to expand...
Click to collapse
I believe you are right I just popped in a 8gb san disk I had brand new never used and phone doesn't ever register it. But as far as I know regardless of Sd card inserted ir not the phone should show external memory in the menu
$oul€$$ D€m0n!

Probably needs format on phone.

diamantericos said:
I believe you are right I just popped in a 8gb san disk I had brand new never used and phone doesn't ever register it. But as far as I know regardless of Sd card inserted ir not the phone should show external memory in the menu
$oul€$$ D€m0n!
Click to expand...
Click to collapse
That is correct. The phone should detect it regardless of the need to format or not.
Sent from my LG-H918 using XDA Premium HD app

I solved this by moving the SIM from the main slot to the side slot (dual SIM model). Weird thing was that anything < 64 gig would read fine, larger SD cards wouldn't. Only thing i can think of is a design flaw whereby the SD card is getting pushed up and not making contact properly due to the SIM underneath it. Try taking the SIM out and seeing if it will read/format/re-read it then?

morrbo said:
I solved this by moving the SIM from the main slot to the side slot (dual SIM model). Weird thing was that anything < 64 gig would read fine, larger SD cards wouldn't. Only thing i can think of is a design flaw whereby the SD card is getting pushed up and not making contact properly due to the SIM underneath it. Try taking the SIM out and seeing if it will read/format/re-read it then?
Click to expand...
Click to collapse
I have an ATT LG V20 that experienced the same symptom so I tried similar procedure by remove SIM card and insert the micro SD then boot up to see if it would first see the SD card and it did, after that I shutdown and reinsert the SIM card and everything is still working.
TV.

S7 & S7E killing my SD Cards....GRR! Any ideas?

I don't know if it's something I'm doing, but this has happened twice now (both with an S7 and now my new S7E).
I bought my S7 with a SanDisk Extreme 64GB Micro SD. After a few months, I kept finding that on taking a photo, it was diverting to internal storage over the SD card. Rebooting sorted it for a while, but it reached a point where it locked itself and could only be read, but not written to. I sent it back to Sandisk and they issued a replacement.
Since then I've now got an S7E (I was part of the N7 scandal). I'm using the replacement Sandisk card I received and today EXACTLY the same thing has happened. The card has become completely locked. I can see the data that was on it from the S7E before it locked up, but I can't write to it. In fact, I can't even format it. If I put it in my PC I can read everything on it but otherwise it's bu**ered.
Where am I going wrong with my S7's and SD cards. Any ideas?
Cheers.

I had the same thing happen. My Sandisk 128gb got corrupted, sent it back for replacement to Sandisk. Then the replacement got effed. Then I bought a Samsung Evo 128gb and it got locked somehow. There are files on it that I can see with a PC, but when in a phone shows as corrupted. Cannot format, cannot do anything with it. I got another 128gb Samsung from Amazon and so far is working. I am worried it will do it again.

Can i ask which version of s7/edge you guys have ? I got the exynos model (n7 scandal as well) I popped in a 128 gb evo card, I'm worried it might do that to me :/

highaltitude said:
I had the same thing happen. My Sandisk 128gb got corrupted, sent it back for replacement to Sandisk. Then the replacement got effed. Then I bought a Samsung Evo 128gb and it got locked somehow. There are files on it that I can see with a PC, but when in a phone shows as corrupted. Cannot format, cannot do anything with it. I got another 128gb Samsung from Amazon and so far is working. I am worried it will do it again.
Click to expand...
Click to collapse
And me. What I've decided to do is just put music on it (i.e. read only)! That's what it's mostly for for me anyway.
EternalSeekerX said:
Can i ask which version of s7/edge you guys have ? I got the exynos model (n7 scandal as well) I popped in a 128 gb evo card, I'm worried it might do that to me :/
Click to expand...
Click to collapse
Mine is also Exynos!

Well for me, it started when I had the AT&T 935A S7E with the SanDisk, but I now have the Exynos S7E and it is the one that the Samsung micro SD went bad on. So both models caused issues. I do flash custom roms and things and know the risks, but have never had this happen on any of my S2, S3, S4, S5, or S6 phones.

I got the same issue but I think its the card with the HC card I didnt have problems but with the XC card it got corrupted...

Try a different SDCard manufacturer to SanDisk?
Possible the replacement was from a faulty batch of cards the original was also from
Think I'm using Kingston

Did you read my post? It happened to me with a Samsung too.

Same issue here with Silicon power 64gb.

Might be the whole XC thing.... I have an old 32GB Samsung EVO knocking around. I'm gonna see if I can kill it haha! Otherwise I'm going to have to send the dead one back AGAIN.

I had te same issue on 3 SanDisk cards all SDXC, I concluded to stick with SDXC, got for the extreme versions.
I tried everything to recover or format.
Sent from my SM-G935F using XDA-Developers mobile app

For those with locked files on the SD, what did you when sending it back?

Probably connext ur micro sd card to the pc and done diagnostics and correct disk sectors.

jijo87 said:
Probably connext ur micro sd card to the pc and done diagnostics and correct disk sectors.
Click to expand...
Click to collapse
Doesn't work. Already tried that.

There is a command you can use on dos that fixes read write or bad partition errors on sd cards . Check this link
https://appuals.com/best-guide-steps-to-fix-a-corrupt-sd-card-via-chkdsk/

Yes that's what's I've run already on my cards. I have tried everything I can find. I do work in the IT field though I'm not a programmer. The closest I've come to getting somewhere is using an application called testdisk. http://www.cgsecurity.org/wiki/TestDisk It will help you recover any files lost but that isn't my problem. The one thing I will say is I'm pretty sure all mine have been formatted as eXfat vs fat. I had one go bad when I was messing around with adoptable storage.

highaltitude said:
Yes that's what's I've run already on my cards. I have tried everything I can find. I do work in the IT field though I'm not a programmer. The closest I've come to getting somewhere is using an application called testdisk. http://www.cgsecurity.org/wiki/TestDisk It will help you recover any files lost but that isn't my problem. The one thing I will say is I'm pretty sure all mine have been formatted as eXfat vs fat. I had one go bad when I was messing around with adoptable storage.
Click to expand...
Click to collapse
I also used to work in the IT field! I spent about 8 hours last time trying to repair the card the first time around - in the end I just sent it back to Sandisk. You need to request an RAM on their web site.
And yea, no CHKDSK /f, or DISKPART CLEAN will touch it. It's so odd how the phone can render a card useless - yet still be completely readable.

I have an sandisk extreme pro 64Gb sdxc since april. Only use it for photos and downloads, sometimes to listen to music. It still works flaweless *knocks on wood*
Have you guys formated the card in the phone? This cause some really bad performance for me, i formatted it with my pc and SDCardformatter and the performance is better now. But sadly not as good as out of the box. Maybe samsung screw something up while formatting with the phone?
Sent from my SM-G935F using XDA-Developers mobile app

[email protected] said:
I have an sandisk extreme pro 64Gb sdxc since april. Only use it for photos and downloads, sometimes to listen to music. It still works flaweless *knocks on wood*
Have you guys formated the card in the phone? This cause some really bad performance for me, i formatted it with my pc and SDCardformatter and the performance is better now. But sadly not as good as out of the box. Maybe samsung screw something up while formatting with the phone?
Sent from my SM-G935F using XDA-Developers mobile app
Click to expand...
Click to collapse
When this happens, the card is locked. If I format the card in the phone it claims to have worked - yet nothing has actually been formatted. If I use SDCardformmatter (or Windows, or any of the 3rd party tools) they all fail. "This disk cannot be formatted"!

Yes I have put them in the phone, and my card says corrupted when in the phone, yet works fine (other than being write protected) in my PC. I did request an RMA on my first 128gb SanDisk, then it happened to the replacement, then it happened to the Samsung 128gb, and I am on my 4th 128GB which is a Samsung EVO Select. I thought it might have had something to do with not doing the full wipe of data in TWRP recovery before switching roms. It does say doing full wipe removes encryption as well as wiping data.