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I am using 64GB micro SD-Card.

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?

Thank you!

Windows 8 SanDisk Ultra 64GB. Class10.

I have another SD card exactly the same model of this one, and that does not have any problem yet.

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)

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Have you tried copying a file to the SD card, safely removing the SD card from within Windows, then mount the SD card on a different computer? It may be an issue that the SD card isn't being properly written to and the file stays in the cache. –  Kruug Jun 21 '13 at 16:47
@Kruug I just tried that. Deleted some files and copied new files to SD card. When I dismount and remount, new files are gone and old files re-appeared. So, I think you are right that operations are not being done properly. Do you have any idea? Thank you. –  klados Jun 21 '13 at 17:04
@Kruug I just cross-tested the SD card, and figured out that the SD card is the problem. I used another SD card and it works well. I cross-put SD card into each slot and also the properly-working SD card works well in another slot. So, the problem is the SD card. Is there any option? or should I stop using that? –  klados Jun 21 '13 at 17:06
Sounds like you have a bad SD card. Best bet is to stop using it. If it's a new(er) card, you may be able to RMA it if you don't want money being wasted or need to have it. –  Kruug Jun 21 '13 at 17:22
@Kruug thanks for the advice. I used that SD card for about 5 months. I synced Dropbox to the SD card, and do you think that this made the problem? Thank you. –  klados Jun 21 '13 at 17:33
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