USB stick issue.
 

I have a USB stick which when I open it there are no files present. Zero.

Yet when I right click properties it shows that the capacity is 90% full. Anybody have any idea why this would be? Thanks

It's either dying or corrupted.

You can always try formatting it and seeing if it restores it back to normal.

Ah, all sorted. If naybody else has this problem in the future, just reformat if you don't mind losing whatever was on the stick. Thanks Crippler.

Hidden files, also issues where particular OSes will keep those files in a recycle bin equivalent until you flush them.