Are the HP-Compaq computers newer then the Toshiba? The Toshiba most likely has a slower 4200 rpm drive. I wouldn't see the point of putting a slower, lower capacity drive into a newer computer. If the computers on auction have had their hard drives pulled it would be better to put in a new 5400 rpm hard drive. 2.5" drives are dirt cheap now. I just got a new 320gb drive for $50 after rebate.