Version Data Path Maximum Synchronous Maximum Recommended Cable Length

(bits) Transfer Rate (MBps) (internal + external in meters)

SCSI-1 (unofficial standard) 8 5 4-5

SCSI-2 8 5 3-4

Fast SCSI-2 8 10 3-4

Fast/Wide SCSI-2 16 20 3-4

Ultra SCSI (SCSI-3) 8 20 fewer than 5 devices: 3; 5 or more devices: 1.5

Ultra Wide SCSI (SCSI-3) 16 40 fewer than 5 devices: 3; 5 or more devices: 1.5