yashsingh1/xdaforums huggingface dataset:
[T-Mobile Samsung Galaxy Note II] JesseMT4G:
I have had these issues as well, but on a S3. Seems to always happen after switching out ROMS or an OTA update. Since then, I take out the card and insert it after the update. No issues since doing it that way

I only use Kingston cards though, but have had this issue in the past.

Just my experience anyway.
[T-Mobile Samsung Galaxy Note II] geniusless:
May be of interest

So I have a stock SGH-T989, 4.0.4, and 32gb ScanDisk HC1, that is about 65% full. My laptop is Vista 32.

Here is what I figured out...

My phone kept dumping the card, if i took it out sometimes it came back. If I restarted, sure it worked every time, but at some point reverted back to problem. Recently I was having the issue with the card removing and re-scanning every time i woke the phone up (periodically).

At a certain point I thought maybe a virus or malware may be the culprit, either way i went with a full phone, and sd card format. Of course I backed up my sd card. Things were running great, like a new phone for a while... DUM DA DUMMMMM Then it returned. Luckily I had Slowly started adding back the apps, photos, music, and specific settings I prefer, taking note of any issues starting up.

Now the juicy part...

When I backed up data via laptops sd reader, at this point I re-organized some folders, and moved some data. Included was renaming my music folder from "music" to "music backup". Things we all do, and I had done like this previous to this error beginning, and before the format.

PROBLEM: At some point while organizing sd card on laptop, I noticed the phones music folder was still named "music backup" from the sd backup, so I thought heck rename to "music". Sure enough, when I put the card in phone again, it almost immediately started error card!!!

SOLUTION: All I did was re-name the folder back to "music" via the phone NOT LAPTOP, and it picks up sd card every time now, and hasn't shown an error (four weeks)...

Like a cross platform error involving changed data or something. The android system seems as though it's getting confused by the CHANGES to SD card via PC reader. When SD card is mounted THROUGH the phone to PC it seems to work fine. Just my observations :)
[T-Mobile Samsung Galaxy Note II] comensart:
you are the legend! problem fixed! )

you are the legend! problem fixed! )
[T-Mobile Samsung Galaxy Note II] janpolet:
Same SD card issue here. Also the GT-N7100 and a Sandisk 32Gb microSD.

Don't exactly know when it started.

Can't reproduce the error either, which makes testing another microSD card hard. The only other one I have is a Sandisk 8Gb.

Also the phone is now losing 40% of battery power overnight.

Even when I turned off Wi-Fi, GPS, Mobile Data and Sync.

I don't get it.

Could this be related?
[T-Mobile Samsung Galaxy Note II] DSF:
I have this issue on galaxy s2 with a 32 gb sandisk class 4.

What ROM/android version do you have on the your s2?

I have XXMS2/Android 4.1.2
[T-Mobile Samsung Galaxy Note II] PhilipTD:
I have had so many problems with micro sdcards from the beginning, that, rather than continue to spend hours and hours trying to find a fix, I have implemented a much less time consuming workaround: I just keep the receipts and exchange them for a new one as a matter of course. Best Buy is only a couple of blocks away and the whole thing takes about ten minutes. I have a tendency to get hyper-focused on technical issues, and sometimes even get obsessed. This has saved me a lot of time. Best Buy changed its return period to 15 days, but ten minutes every two weeks is worth it.
[T-Mobile Samsung Galaxy Note II] internetpilot:
Just an update on my situation. I'm currently using a Samsung 32gb Class 10 card in my Note 2 without any issues reported by SD Monitor. I still have my music and custom alarms stored in internal memory though. Having my play lists and music alarms disappear (and not wake me up) is what started all this for me, but I don't feel like moving it back to my SD card to test it when this is working fine.

I moved the Patriot 32gb Class 4 card back to my Acer Iconia A500 tablet after the POS Sandisk 32gb red/grey UC-1 card started falling in my A500, too.

I contacted SanDisk about returning the card, but it's a ridiculously slow process, leading me to believe they know they have a massive problem on their hands. They continue to send email replies about once per week, asking for more information each time. In other words, I'm getting jerked around. It's a shame it's outside the Amazon return window.

So I'm now using the card in my Swann Freestyle action camera (it's like a GoPro knockoff) for kayak fishing. Since the files are removed after every trip and then the card reformatted in the camera, I haven't had any problems with it.

If SanDisk keeps dragging their feet, I might just keep it for use in that camera. SanDisk has made it clear that at best they will only send me a replacement of that exact model of card, so there's really no point when I only have a problem with that specific model of card. If it fails in the camera, I'll probably just toss it.

Lesson learned with SanDisk. I'll never buy another one of their products again, including other namebrands that are using their guts in a rebranded card. Again, they're THE big name in the digital photography world, but I really don't know how they achieved that reputation giving this ongoing, unresolved debacle. I suspect we all now know why the previously high price of their UC-1 class of cards dropped through the floor, whereas other manufacturer's Class 10 card prices have remained about the same.
[T-Mobile Samsung Galaxy Note II] janpolet:
An update on the problem I was having.

I've been using an SanDisk 8Gb microSD card in my Note II without any issues for about 10 days now.

No more unexpected unmounts of the card and no more strange power drains (40% overnight).

SanDisk is sending me a new 32Gb microSD card. :) I had to destroy my 32Gb card first and send pictures of before and after I did that.

I'll report back how the new card behaves when I've received it and had time to test it. :fingers-crossed:
[T-Mobile Samsung Galaxy Note II] aldapooh:
Hi everybody,

just want to make an update:

I opened two customer support tickets with Samsung and with SanDisk. Samsung recommended to verify the card, and get a new one if possible, when SanDisk was more clear that it might be a card issue and made an offer to replace the card.

In short I recieved a new card in 2 weeks, and it works now without issues for couple of days. If you are interested in details here is a reply from SanDisk:

"SanDisk has been made aware of potential product issues involving a very small percentage of its 32GB and 64GB SanDisk Mobile Ultra microSD cards. Under certain circumstances the cards may lock up and the card becomes inaccessible. The issue has been identified and a manufacturing fix has already been put in place. SanDisk stands behind its products and any customer who experiences this issue with the microSD cards cards is asked to contact the SanDisk support center for a resolution immediately. So it is an issue with the card itself and we will replace the card with a functional one."

Hope it helps.
[T-Mobile Samsung Galaxy Note II] geniusless:
Again, my sd card that WAS "failing" is now at almost a month working fine. 32gb class 10 in S2 stock. Seriously guys, PLEASE take note if you are unmounting sd cards, REMOVING, and changing files & folders via ANOTHER PC or TAB or PHONE then mounting back into original device. I reeeally think this has to do with cross platform errors in data changes or caching bugs. Soon as I did all my sd card work while it's in the phone mounted to the pc IT DOES NOT HAVE ERRORS AFTER FOR ME!

I was getting the music files failing after 15 minutes or so... Then i was getting unsupported and damaged files on sd card... Then the sd card was scanning and mounting everytime I woke the phone up from sleeping... So I have been dealing with three of the varying sd card issues. I did a full format on phone and sd card, then slowly added apps. Then slowly added data. Then slowly added media, and had no issues. SOON as I made folder changes to sd card VIA laptops card reader my phone started back up IMMEDIATELY!!! So I formatted both again, added all my folder, data, media at once. BUT I DID IT with sd card IN phone, and phone mounted to laptop. EVEN AFTER data changes to sdcard via phone-laptop connection I am month error free.

PS maybe it's from the original device creating a cache on sd card, then when we make media/data changes on sd card OUTSIDE of original device, the cache is now wrong when it makes a call for data? Redirect? Also that would mean that a new cache has to be created upon insertion of changed card? Which could potentially confuse the device? just some questions that relate i feel...
[T-Mobile Samsung Galaxy Note II] internetpilot:
I don't know about you, but when I connect my Note 2 to my PC via USB, it dismounts the card from the Note 2, so that's not going to work.

Plus, all these memory cards should be cross-platform, and if they're not then I don't want to use them. All other SD cards I've used handle cross-platform without any issues.
[T-Mobile Samsung Galaxy Note II] howard bamber:
Mine works so good used an akp to swap it with my crappy 16 gig -only 11gig usable internal card so ive 64 gigs internal.B4 I did it it worked perfectly,xcept the odd rom where I got that sillyness so the rom went and the card behaved. Figure it out. Bad rom.

SENT BY REVERSED ENGINEERED ALIEN TECHNOLOGY.........
[T-Mobile Samsung Galaxy Note II] geniusless:
Right, I'm sure you understand more about it than I do. All I noticed was if cards IN phone when connected to laptop, files transfers and changes were fine. But if I did changes to the card via laptops card reader slot, I immediately got errors starting up again??? That's where I think the bug is somehow...
[T-Mobile Samsung Galaxy Note II] theandre:
Here is my story.

So I got Optimus G E970 and converted it to Nexus 4 while keeping SD card functionality. I also bought brand new 32gb San disk class 4. Main purpose was to keep music and media on SD card. So I had the music caching hack set up which kept all the music on the SD. Long story short the card started acting up weeks after first insertion. It had gotten to such a bad condition where the phone would report the card as damaged and would refuse to detect it at all. After some trials in my Mac I finally formatted it and now it works fine in my Pentax k-01. After having the 32gb San disk class 4 fail I decided to go for San Disk 16gb class 2... It worked fine for about three weeks and now it gives SD unexpectedly unmounted error as well... It is so bad when it happens with music app trying to download music... The music app ends up wasting internal memory.

Mystical stuff: both cards work with my Pentax . When both formatted same way the 32gb card allows only 2min FHD video recording while the 16gb card allows 15min of FHD video. Seems like there is some controller differences between the two .

My phone has been running AOKP 4.2.2 all this time with music caching hack.

Something is telling me that the reason could be the caching on SD card with the music app. My gut is telling me the way its doing the caching is not working well with external memory.
[T-Mobile Samsung Galaxy Note II] kemin:
a tip for those who have these problems: send the sd in assistance or just ask a refund and buy a new/another one
[T-Mobile Samsung Galaxy Note II] DKM119:
So I order the 64 Gb SanDisk card from amazon a few days ago, without knowing of this problems.

I'm planning on format it first but should I do it on the phone or in the pc?
[T-Mobile Samsung Galaxy Note II] Jerry D:
I have been using a SanDisk 64gb class 10 card for atleast 4 months on this phone WITHOUT any issues. I used it straight out of the packaging. I did not format it at all. I recommend you do the same.. There are other people who haven't had issues with their 64gb cards also so you might just want to wait to see what happens.
[T-Mobile Samsung Galaxy Note II] DKM119:
Great thanks.
[T-Mobile Samsung Galaxy Note II] BTT8:
I finally got around to contacting Sandisk. They will be giving me a replacement.
[T-Mobile Samsung Galaxy Note II] tehstfu:
+1

This card worked flawlessly straight out of the packaging in my S III, but within two days of owning the Note II, everything went south. Neither the phone nor computer could mount the card correctly; both saying that the disk was empty. I tried the card again several months later and found out that none of my files were lost, but it does still dismount unexpectedly. Spooky.
[T-Mobile Samsung Galaxy Note II] adavidso:
Thanks!

This worked for me.

S2x T989 (koodo)

Android 4.1.2

32GB adata class 4 SD

Was mounting and unmounting dozens to hundreds of times/day, but never when plugged in (e.g. charging overnight). Did not seem to be a physical problem with SD slot or card. Formatting SD would temporarily help, but it would come back. Had tried disabling various power saving, various ways of formatting in computer or phone or phone via computer, etc. Nothing worked until now.

Wake Lock app with Partial_Wake_Lock seems to have solved issue!
[T-Mobile Samsung Galaxy Note II] ToddL:
When I installed Wake Lock and set to partial, it seemed like my SD card unmounted, but never re-mounted. It was not recognized at all. When I uninstalled Wake Lock, my SD card came back (of course with the usual removed/preparing messages). Thus it doesn't seem like Wake Lock is the fix to the problem for me.
[T-Mobile Samsung Galaxy Note II] wbd:
Thank you for this information - the Wake Lock app seems to be working well for me, it's a good interim solution.

Just hope the 4.2.x firmware includes a proper fix.
[T-Mobile Samsung Galaxy Note II] Reza382:
I'm having the same problem, mine is a toshiba 32gb class4. it was good for 6 months but now the notifications R :

Removed

preparing SD card (checking for errors.)

SD card safe to remove (You can safely remove SD card.)

in a constant loop!

some times it says try reformating that makes it work until the next lock screen or sleep.

what should we do?

---------- Post added at 09:39 AM ---------- Previous post was at 09:28 AM ----------

:) yeah my problem showed after nearly 5 moths being rooted.

Sent from my GT-N7100
[T-Mobile Samsung Galaxy Note II] janpolet:
About a week ago I finally got around to copying everything onto the new microSD card SanDisk sent me.

No problems so far. :)
[T-Mobile Samsung Galaxy Note II] titooo7:
I'm having the same problem with my G.Skill sdcard so I don't think it's a Sandisk problem.

The SD card is not detected on my laptop and the phone usually recognize it only once per week, but as soon as I lock/unlock the device I get the f*cking notification...

I just downloaded Wake Lock app, hopefully it will work... Otherwise I'll have to buy a samsung micro sd card...
[T-Mobile Samsung Galaxy Note II] lncoln:
I had this problem also...sandisk 32 gig class 10...was doing this for about a month...it was causing a massive screen on lag when waking the phone (4 - 6 seconds), draining the battery (full charge lasted 7 hours with light usage), and slowing down the processing to like dial-up speeds.

I was finally able to tranfer all 31 gigs onto my computer (it kept saying "blank sd card", and prompting me to format...glad I didn't).

Exchanged my card at the place I bought it, haven't had the problem since...been 2 weeks (knocking on wood).

this.......is...my BOOM stick!!!
[T-Mobile Samsung Galaxy Note II] stanglifemike:
My SanDisk 64GB Ultra micro-sd card has been performing flawlessly without a single hiccup!! I bought 2 around the first of December 2012, 1 for my Evo 4G LTE and 1 for my Asus Infinity. The one in my Evo 4G LTE is now the one in my Note 2. No problems when moving the card from my Evo to my Note 2. I've also briefly swapped the card from my Asus Infinity to my Asus Prime just to install a file, but no issues there either. Looks like it's mainly an issue with the Note 2 though, which really sucks . I went from 2 SanDisk 32GB Class 4 cards to 2 SanDisk 64GB Ultra cards and the difference is night and day!! Good luck to those of you still having issues, though it appears that many of you have resolved what issues you had.

SwiftKey'ed from my White Sprint Note 2 using XDA Premium
[T-Mobile Samsung Galaxy Note II] amish4u1983:
I have been in contact with SanDisk India team thru emails and today they have replied stating that they have 2 Replacement Centers in Mumbai. 1 in Andheri East & 1 in Grant Road East. I am waiting for the complete addresses so that I can visit them ASAP and get my SanDisk Ultra Class 10 (32 GB) MicroSD card replaced. By the way, I am facing this "SD Card Unexpectedly Removed" error since past 3 months and really getting annoyed as every time I have to Reboot my Android Phone (Karbonn S5 Titanium) and the problem gets solved for few hours. It drains up the battery so fast which is again the most sad part. I will keep you guys posted on my communication with SanDisk India team. By the way, I have not received the exact response as you have quoted above in your message and will certainly check with them here in India if they trouble me on replacement front. Thanks for sharing that official message which you had received from SanDisk, it's a great help!
[T-Mobile Samsung Galaxy Note II] VivaLaCam92:
I posted on this problem just a few months ago when i recieved my note 2.

I was told by numerous people from different sources & forums to try a sumsung card so needless to say i spent $80 to ship a Genuine Samsung microSDXC UHS-I Card overseas where I'm currently deployed.. after 2 months I finally recieved it today & Now I have a new problem, My note 2 won't freaking mount the thing. I know it's not the card as my computer, buddies pc, buddies mac, galaxy s3, galaxy note 10.1, & nikon d5100 series camera all mount it just fine. then i turned to the phone I've tried 2 other cards of different brands and they all work just fine.. i've also formatted the card in both ntsc & exfat & still nothing.

can anybody on here point me in the right direction with this freaking card.
[T-Mobile Samsung Galaxy Note II] amish4u1983:
Serial # and Details on backside of the SD Card

Just to nail down the real problem, I am sharing the Serial # and Details which I forwarded to SanDisk Team recently. May all the other members affected with SanDisk Ultra (Class 10) 32 GB MicroSD card can check the same and post here to help others.

- All the information printed on the face of the card. (Including the product code) - SanDisk Ultra, 32 GB, MicroSD HC I

- All the information printed on the back of the card. - 3054DGTJM10R, MADE IN CHINA

The following information was captured from the original packet where the SD card was placed when it was delivered at my home. Thanks!

Product Code: SDSDQUA-032G-U46A

Product Description: SDSDQUA-032G-U46A Mobile Ultra Class 10 /U1 Android

Month of Manufacturing: 02-2013

Month of Import: 03-2013
[T-Mobile Samsung Galaxy Note II] MrHughHansen:
I have the same problem with 3 different sd cards, one of them was when I used an Adata 32GB 4class in my I9070 then I bought another sd card adata 32gb 4 class, after.few weeks the phone didn't read the card, but sometimes it did read the card, a month ago I bought a N7100 and a new sd card, but I had the same problem, I don't know, I think that the real problem is about Samsung Smartphones, is rare that a lot of people have the same problem, but the people who have a ScanDisk Ultra SD 64 GB, don't have this problem, I'll try to use that SD card.

Enviado desde mi GT-N7100 usando XDA Premium HD app
[T-Mobile Samsung Galaxy Note II] Duckhunter75:
Add me to the list!

I've used two different SD cards in my Note2. First a PNY 32GB and now a Lexmark 16GB. I noticed the problem when my phone became incredibly hot and the battery drained - listed Google+ as the guilty party. Every time it uninstalls the card and then re-installs it, Google+ checks through all the photos I'm guessing. The cards work for a few weeks and then the problem starts up. Not sure why it takes a few weeks, but that's how it went with the new card as well.

Anyway, I installed the Wake Lock app during lunch today and that does seem to fix it. Since then the card seems fine and the battery usage looks closer to normal. This gives me hope that it is not a hardware issue and is somewhere in the software. Tomorrow will be my first full day running Wake Lock so we'll see how it does. It clearly won't be as good as before, but at least I can still use my SD card.
[T-Mobile Samsung Galaxy Note II] Rhiannon224:
Get SD card monitor in the Play Store and it will tell you if you're card is unmounting, if it is, it's a bad card. Also, Google+ drains the battery so always log out of the app.
[T-Mobile Samsung Galaxy Note II] Duckhunter75:
I thought about monitoring it but I saw the message in my notification pretty often so I feel like that is what is happening. Putting the card on the computer and long format shows no errors. Plus, using the wake lock app I can use the card with no problem. Not sure what makes it a bad card???

I know Google+ uses battery - but not 30%+ of the usage like I see with the SD error.
[T-Mobile Samsung Galaxy Note II] nickhepfer:
I notice that almost everyone is having this issue is running a Sandisk card, I am having this same issue as well and I am running a Samsung 32GB class 10 card. It just started doing it 2 days ago and I have tried reformatting the card and it works for a few hours.

So I my take is that its a hardware/software issue and buying a new card is a waste of money
[T-Mobile Samsung Galaxy Note II] Rhiannon224:
I had the problem with SanDisk 32 gb class 10 ultra. No problem in months with Samsung class 10 card. I have 2 Note2s and both had problems with SanDisk class 10 ultra cards. My brother has the issue with his Note2 with the 64gb SanDisk class 10 ultra. If you ask me it's SanDisk not working well with the device.
[T-Mobile Samsung Galaxy Note II] randasecret:
after having the same problem on my note 2 and sandisk 32gb uhs-1, I switched from my htc chacha the Adata 16gb class10 to note 2 and sandisk to chacha after one month all is working well. is it incompatibility between samsung and sandisk
[T-Mobile Samsung Galaxy Note II] da_nyce1:
I contacted Sandisk about the issue and they are replacing my card. I should have a new one in a week or so.
[T-Mobile Samsung Galaxy Note II] collinsz:
my kingston 32gb fried on my note 2.

My kingston 32gb sd also fried after 3 month using it on note2.. first I thought it was the phone. I did the factory setting on the phone and regret doing it later on as I forgot to back up my contact on my phone as I thought I can retrieve it later from my sd card.. but I am totally wrong and found out the sd card was fried.. not my pc detect it anymore.. so annoyed with this.. later on when I look a solution on the web.. I am not alone with this mess caused by gs3 and gn2.. what big surprised and disappointment over top flagship from Samsung. .
[T-Mobile Samsung Galaxy Note II] internetpilot:
I'm beginning to suspect it has to do with how much you actually use the card, too. Even after I replaced my Sandisk 32gb UHS1 card with a Samsung class 10 card, I would still get infrequent bad dismounts. When I put my music on internal memory and just use the card for photos and infrequently watching converted movies now, I don't have any bad dismounts. I use my music every day with my alarm clock app and playing it in my car with bluetooth, I think that increased the chances of something happening to the card, regardless of the namebrand. I still think it's Samsung's fault. My "faulty" Sandisk card is now being used almost weekly in my GoPro without any issues at all.

I just bought my two boys S3's and put Samsung class 10 32gb cards in them. I'm going to put that SD Monitor app on there and watch the logs.
[T-Mobile Samsung Galaxy Note II] randasecret:
Right I realized that two, if you used frequently you will get dismounts. On my note 2 I was using directory bind it was a disaster and then I stopped the binding and began to use it only for camera the dismounts decreased.