Erasing USB flash drives?

Has anyone come across a program that quick erases a USB flash drive stick,
so that a simple unerase program doesn't show what files were on it? (I
don't do this for security reasons, I only do it for my own convenience
(when I'm trying to recall what changes I make on the drive subsequentially;
it's hard to explain :-).

So here is what I have discovered:
"Eraser" doesn't seem to be able to do it for flash dirves, although it
works well on other drives. (I'm just talking about using the basic erase
options here)

The WinXP disk defragger(s) don't do it, either.

BUT the standard Win98/ME defragger DOES do it! And you only have to run it
for a few seconds to clear traces of any file entries; it doesn't need to
run to completion.

Clearly the Win98/ME defrag works a lot better in that one regard (on FAT
volumes) than the WinXP defragger(s) do. It somehow erases the FAT table
entries, where the Win XP defraggers don't.