I can bore you for hours. Look instead:

http://www.hackzapple.com/phpBB2/viewtopic.php?t=977&sid=22f87401a4953145e7769db1c04e9607

Sammy Lightfoot: same company, same idea.

Search for the "signature" $CE $03 $XX $EF $03 $XX, where $XX = wildcard,
found it at track $10 sector $0F byte $00: change to $60 $AD.