depends on the drive...i have 2 seagate 250gb sata hdds, 1 WD 250gb sata hdd, 1 Seagate 500GB hdd, and 1 WD 500GB hdd - all 7200rpm 16mb cache drives I think, but copy speeds really vary among them. The 500gb disks are the fastest ...avging 90+mb/s copies, while the 250s are a bit slower. In...