So if I wanted to use a mobile rack to swap the HDs between computers it wont work?
How is that done?

The only difference between the two PCs is,

Asus K7V-T
Athlon 1000mhz T-Bird Slot A

Asus K7V
Athlon 1000mhz Classic Slot A

Everything else is the same, ram, video card, OS and drives.

KomaToast