i have an HP computer that has a quantum 6.4 gig hd in it. I did something that toasted the hd my computer would not boot nothing no matter what i tried so Hp sent me a new drive as i was still under warranty..new drive works just fine... Out of curiousity i put the old drive in my 486/66 project computer and got it to boot..but could only fdisk and format to 504 megs because of the bios i suppose... then i put it back in my hp and it it will not boot still but it works in the 486 any ideas????