> That aside, why bother what is on the disk? In a FAT system, the disk gets
> filled from end to end, bits get wiped in the middle by a user deleting, and

No, bits do not get wiped when you delete.  If you use a disk for a while,
the whole thing will be filled with leftovers.  Say, you delete 90% of it,
filling that 90% with zeros will make a 'dd|gzip' take 1/10th of space...

Deleting a file (in FAT or most other filesystems) just twiddles a bit in
a directory that says the space is available.

-Tom

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