Parallel SCSI Interface Chart
Bus Lengths in metres
MHz Single Differential Specified Average
Ended Transfer hourly
Rate throughput
SCSI-1 (8) - 1986 5 6.0 no 5MB/s 10-18GB/s
Fast SCSI (8) - 1994 10 3.0 25 10MB/s
Fast/Wide SCSI (16) 10 20MB/s 40-72GB/s
Ultra SCSI (8) - 1996 20 1.5 25 20MB/s
Wide Ultra SCSI (16) 20 40MB/s 80-144GB/s
Ultra2-SCSI (8) -1997 40 no LVD HVD 40MB/s
12 25
Wide Ultra2-SCSI (16) 40 80MB/s 160-288GB/s
Ultra3-SCSI (16) - 1999 80 no LVD no 160MB/s 320-576GB/s
12
Ultra320 (16) - 2002 80 no LVD no 320MB/s Up to
Double
12
1152GB/s
Edge
Small Computer System Interface (SCSI) variants:
Protocol Link Rate Bus width Max. devices
SCSI-1, SCSI-2 5MB/s 8 bit 8
Fast SCSI 10MB/s 8 bit 8
Fast Wide SCSI 20MB/s 16 bit 16
Ultra SCSI 20MB/s 8 bit 8
Wide Ultra SCSI 40MB/s 16 bit 16
Ultra 2 SCSI 40MB/s 8 bit 8
Wide Ultra 2 SCSI 80MB/s 16 bit 16
Wide Ultra 3 SCSI 160MB/s 16 bit 16
Ultra 320 320MB/s 16 bit 16