Dennis, I had the same question when I replaced my 30 GB (master)/40 GB combination with a new 200 GB drive. I was told it really did not matter. I did a CCC backup of the 30 to the 40, then removed the 30 GB hard drive and replaced it with the 200 GB and strapped as the Master and then cloned the 40 to the 200. My G4-450 AGP only sees 120 GB but it has been working great and the 40 is now my backup and the 30 is in the drawer. Dick On 10/1/04 11:03 AM, "g4-request at listserver.themacintoshguy.com" <g4-request at listserver.themacintoshguy.com> wrote: > My question is, does having the 80GB drive set as slave have any > affect on performance? Would it make any difference if I changed the 10GB > drive to slave and the 80GB drive to master? Thanks. > > Regards, > Dennis Murphy.