Removal and Replacement Procedures
3-19
Table 3-2
Installing Optional SCSI Devices
continued
Guidelines
Comment
Turn on all external SCSI device
before
turning on the
power to the workstation.
This enables the system board controller to recognize
the external SCSI device.
All SCSI hard drives must be either internal or
external, but never both.
The system accommodates a combination of other
external and internal SCSI devices, such as tape and
CD-ROM drives.
Do not mix Wide-Ultra and narrow SCSI devices on
the same SCSI chain or the same controller.
Wide-Ultra can only be mixed with Wide-Ultra SCSI
devices. Narrow can only be mixed with narrow SCSI
devices.
Do not mix Wide-Ultra2 and Ultra3 with other types of
SCSI devices.
Wide-Ultra2 and Ultra3 SCSI devices can only be
mixed with each other and can coexist in any
combination.
If two controllers are installed, each may use SCSI
devices having widths and speeds different from the
other.
If a 68-pin data cable is used on a controller having a
50-pin SCSI devices, use an internal cable adapter
(Compaq number 199618-001) or an external cable
adapter (Compaq number 270187-B21).
CAUTION:
Do not route cables near the intake to the power supply. Cables routed in this
manner may block airflow to the power supply, causing it to overheat.
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