I did something like this when I was a kid, in QuickBasic. Not as sophisticated - it would just randomly create, append to, and delete files.<p>I tested it on floppy disks - if you let it run for a while, the remaining free space was so fragmented it was almost unusable. You could hear the poor floppy drive seeking like crazy just to open a tiny text file.<p>The fun part was defragmenting it afterwards - I miss the days of the graphical defrag that Norton and MS had.