Hi Cowbait,
If still bad, you can try with these apps portable (free), if it’s fake:
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It’s similar to H2testw, but has a quick option, and takes minutes: USB Flash FakeTest, http://filecloud.io/n074g3x5
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To obtain the internal data of the UFD, you can use the apps (free): USB Flash ChipGenius, http://filecloud.io/rqa7etmv
USB Flash DriveLetter, http://filecloud.io/vgqzcdyh
USB Flash Deview, http://filecloud.io/srp2hegw
If the above steps have not solved the problem, do not grieve more:
Contact SanDisk Technical Support who will replace the device, if it’s authentic and is within warranty.
Link: http://www.sandisk.com/about-sandisk/contact-us/
Luck, and then you tell us, what happened, please.
Regards, Alfred. (Google translated)
