This is not good, needless to say. There is some serious corruption in the file system and it may be due to physical flash damage which isn't repairable. Would you like to try a low level format? It might work or it might tip the flash drive past the point of recovery, it's a risk i've taken in the past which has sometimes paid off. If you want to try, download this proggy and follow the GUI prompts:
Code:
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Just use the free version, it works the same as the paid license - only slower. Good luck.