My SD card deletes new files by itself

I am using a SanDisk Ultra 64GB (Class10) micro SD-Card on Windows 8. I have another SD card exactly the same model of this one, and that does not have any problem yet.

I always put it into my laptop slot for secondary storage.

Recently, I found a big problem that my SD card won't work properly.

I mean, when I copy new files to the SD card. Firstly, it appears right. The file is intact and I can access the file. However, whenever I restart Windows 8 or when I wait about a few hours, the copied file is gone! just gone!

But the old files (before the problem appeared) still remained well.

Thus, I tested more.

Amazingly, when I delete the old files that means the files that I copied days ago, it seemed to be deleted at first. However, when I restart my Windows or wait for a few hours, It re-appear! Wow...

That does not happen when I refresh the Explorer or press F5. I have to wait for a few hours or reboot my laptop.

In summary:

• My SD card seemed to be 'held' at a certain moment.
• Whenever I copy new files, they will be deleted.
• Whenever I delete old files, they appear again!

Does anyone know similar issues?

I don't know whether it is relevant but this problem appeared about when I installed double-twist player but I never run this program after I acknowledged this SD card issue for sure.

4 Answers

1. Power off the phone.
2. Remove the SD card and put it in a card reader and connect it to a PC.
3. Run cmd to open a command window.
4. Type chkdsk /f drive: (for example, chkdsk /f E:). You will probably see that corruption was found.
5. Add files from your computer.
6. Repeat chkdsk /f drive:.
7. Safely eject the card and plug it back into your phone.

I know this thread is old, but here is an update about this issue, There were batch product line defective issue about SanDisk Ultra series microsd card, it will hold the data for the while(actually writen to cache) , but everytime you remove the card, it disappearrd. I own one SanDisk Ultra also and I returned it for RMA.

Your SD card is probably in read-only mode, just try to mode the side "switch" to read/write mode. This will probably fix it, if not save your current files in your computer an run an sd formatter. If the problem still persists, run a "Check Disk" on the SD card. This will solve your problem, if you do all these and you can't still move files into the SD, that card is broken.

I have the same problem with my Windows 8.1 laptop and just about every 64GB card I own.
The switch on the card is unlocked. When I write something onto the card, it appears as it should. When I safely remove it and check later, the files are gone. When I check it on a different laptop, they are gone. A Tech said he has heard (somewhere) that the larger memory cards are not being handled properly by Windows 8 and he recommended I go back to a 32 GB card. He tested several of his 16 GB and 32 GB cards (and two thumb drives) in my laptop. No problems. Thanks for listening.