I have a puter that has a 80gb WD H.D. I just bought a 160gb seagate H.D. to replace it. I tryed hooking up the new 160gb drive as a slave and the origanal as master so I could transfer all the data onto the new one, but the puter is not recognizing the drive. I go into windows on My Computer and only see my main 80gb drive. I tried to unhook the 80gb drive and just format the new 160gb and it wont read it. I then downloaded Seagate DiskWizard and tryed to see if that would work, but it didnt. I went into bios to see if I could have it auto detect the drive...but wont. It shows the model # in bios, but wont detect. The 80gb hard drive that has been in it uses the IDE ata flat ribbon cable. I dont know the type of motherboard so I dont know what it is...ATA 100, ATA 133. So the new drive I bought I got it as a ATA 100 figuring it wold work. I just figured it would be compatible, its the same cable hook up...Does it matter? And I noticed when i ran the DiskWizard it said there was no SCSi drive detected. WHat is SCSI? Is that my problem? Im lost on this one. Can anyone help?