I'm just going to replace the 6 gig harddrive in my wife's rev 2 (tray loading G3 333Mhz) iMac with an 80 gig one which i've installed Tiger on. I recently replace the Apple superdive in my Dual G5 with a double layer Pioneer A108 and I was wondering if I could put the old drive in my wife's iMac or is it physically too big? Any way? If not, could I get the DVD burning to work with the drive in an external case (the old iMac only has USB1 not 2 or firewire) - wouldn't mind in it burnt slowly.