The EIDE & SCSI Speed Comparisons

InterfaceModeMaximum Data Rate (MB/s)
EIDE ATA-1PIO-0
3.3
SCSI-1SCSI
5.0
EIDE ATA-1PIO-1
5.2
EIDE ATA-1PIO-2
8.3
SCSI-2Fast SCSI
10.0
EIDE ATA-2PIO-3
11.1
EIDE ATA-3PIO-4
16.7
SCSI-2Fast-Wide SCSI
20.0
SCSI-3UltraSCSI
20.0
EIDE ATA-4Ultra
33.0
SCSI-3Wide UltraSCSI
40.0
SCSI-3Ultra2 SCSI
40.0
EIDE ATA-5Ultra
66.0
SCSI-3Wide Ultra2 SCSI
80.0
SCSI-3Wide Ultra3 SCSI
160.0
SCSI-3Ultra 160 SCSI*
160.0
SCSI-3Ultra 320 SCSI**
320.0
* Ultra 160 is a fixed subset of Wide Ultra SCSI (i.e. DT, CRC, and Domain Validation).
** Ultra 320 supports a minimum of 320 MB/sec with Domain Validation, and Packetization. Currently Ultra 320 uses the SPI-4 standard that is still under development in the SCSI T10 committee.

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Extracted from "Integrating for Peripherals", Volume XVIII, Number 8, page 28. Updated information extracted from Computer Technology, May 2000, page 43.

Date of last revision: 17 December 2001.