WHITE PAPER (contād) Compaq Professional Workstation - Key Technologies
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Models of the Compaq Professional Workstation AP550 and SP750 come standard with a one-
inch 9.1-GB or 18.2-GB Ultra3 SCSI 10,000 rpm hard drive, as well as an integrated Adaptec
Ultra3 SCSI controller. Ultra3 SCSI is backward-compatible with all previous versions of SCSI.
When an Ultra3 drive is installed on a previous-version (Ultra2 or Wide-Ultra, for example) SCSI
bus, performance defaults to the specifications of that bus.
Note: Ultra3 may also be referred to as Ultra160M in the industry. Some vendors have chosen
the Ultra160M to identify the next generation of SCSI technology. Compaq has chosen to refer to
it as Ultra3.
0
40
80
120
160
MB/sec
UDMA
33MB/sec
UDMA
66MB/sec
Ultra160/m
SCSI
160MB/sec
Fibre
Channel
100MB/sec
Ultra2 SCSI
80MB/sec
Ultra160m SCSI Compared to Other I/O Interfaces
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