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[ The PC Guide | Systems and Components Reference Guide | Hard Disk Drives | Hard Disk Interfaces and Configuration | Small Computer Systems Interface (SCSI) | SCSI Protocols and Interface Features ]

SCSI Protocol Map

The table below shows how the two most important protocol characteristics--bus width and bus speed--map into the different names for SCSI transfer modes and feature sets that are commonly seen in the SCSI world. Links are included to each of the SCSI transfer modes or feature sets. The throughput for each SCSI variety is also shown:

Signaling Speed

Narrow

Wide

Mode

Throughput (MB/s)

Mode

Throughput (MB/s)

SCSI-1

SCSI-1

5

Wide SCSI

10

Fast

Fast SCSI

10

Fast Wide SCSI

20

Fast-20

Ultra SCSI

20

Wide Ultra SCSI

40

Fast-40

Ultra2 SCSI

40

Wide Ultra2 SCSI

80

Fast-80(DT)

--

Ultra3 SCSI, Ultra160(/m) SCSI, Ultra160+ SCSI

160

Fast-160(DT)

--

Ultra320 SCSI

320

Next: Summary of SCSI Protocols and Transfer Modes

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