I had a flash drive, and although I deleted everything off, it said that 1GB/1GB was used, and it was full. So I reformatted it [MS-DOS format], and got my 1GB back. But again, whenever I store a file on it and delete it, my space is not recovered. For example, I put a 4MB picture on it, then deleted it, and now I still have 4MB less space. Does anyone have any idea what's going on here?