Pouxhawk is right about the Quantum drives.
Here's a list I got off Fostex Japan's site:
Fireball Plus LM (High speed type, 10.2/15./20.4/30GB)
Fireball Ict 15 (Normal speed type, 7.5/15/20/30GB)
Fireball Ict 20 (Normal speed type, 10/20/30/40GB)
MPG3102AT-E (Normal speed type, 10.2GB)
MPG3204AT-E (Normal speed type, 20.4GB)
MPG3409AT-E (Normal speed type, 40.9GB)
I'm not 100% sure, but maybe someone can confirm this, I guess any 3.5 inch E-IDE drive would work. Or have I got that totally wrong...?
btw the list works for VF08