I'm wanting to build an external firewire enclosure from scratch. I'm getting a bridge from http://www.fwdepot.com. Most likely this one here.

i need a power supply and was thinking about using an ATX power supply. But i know almost nothing about them. Can a switch be put on them like an old AT supply for immediate on and off. Or would that damge the drives and PS?
any help would be nice.

2.4gHz 15" MacBook Pro, 1.66gHz Core Duo Mac Mini, 2.5gHz G5 QUAD, 733mHz Quicksilver, 450mHz G4 Cube, 700mHz G3 iBook, 350mHz Sawtooth G4, 350mHz Revs. A and B B&W G3, 16mHz Powerbook 100, 8mHz Macitosh Classic.