I'm always puzzled by these numbers. How come copying files between my HDs never seem to exceed 2.5MB/Sec (burst speed)? My SCSI card is rated as 20MB/Sec Maximum, but copying speed seem to be around 1MB average. What keeps it from reaching the maxium potential speed? Changhsu Liu =========== > >SCSI-2 > "Fast" SCSI, 50 pins, 10MB/s max. Usually a standard ribbon >connector internally and a D-shaped high-density connector >externally. > >SCSI-3 > Not, the last I'd heard, an official standard, but being used by >some vendors to refer to "Wide" SCSI, 68 pins, 20MB/s max, using a >D-shaped high-density connector (but wider than above). > >Ultra SCSI > SCSI-2, clocked up to 20MB/s. > >Ultra Wide SCSI > Wide SCSI, clocked up to 40MB/s. > > .....