If you've used this flash drive for some time, it have gaps or holes in its file directory. When it copies it spaces it around rather in one congetious area. You then need to reformat it to refresh the flash drive. Also, be sure you've allow it time to finalize or you eject properly, don't rush it. This is one way it can be corrupted, further it can corrupt the whole flash drive. Also, be sure if you use some "secure feature" that if optionable to turn it off to reduce the time factor(up to you). Have you tried another flash drive and check its results?
I'm currently using a Lexar Jump Drive and I have never had problems in the past. Right now I'm using a crummy desktop at work and they have no wi-fi for my laptop. Anyway, so my gripe is that whenever I download files i.e. images or video files from the net to desktop, they work fine. I then transfer them to my jump drive and try to access them on my laptop and they're always corrupt! I don't get what's going on. I have other files on the jump drive and they work fine and when I use the jump drive from my laptop to desktop it's fine it can read the files. I don't get wat's going on can anyone help?! Thanks!!