I knew some might have problems when I bought them. The first one I used worked as expected. The second failed almost immediately during data transfer. I haven't used them since, so I can't say how many of these work overall. We bought them primarily for temporary file storage, primarily for file transfer. Put movies or music on it to watch on our TV so our expectations weren't too high. I wouldn't trust them to store important data that you don't have a backup for. Given the possibility of using more of these, I wanted to update my review. I would definitely not buy these again. I believe we could use them many times before they all stopped working. If I even considered formatting the one I was using, the other two in the pack were already giving up life. I never had high expectations but it was a waste of time.
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