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Internal Drives in Servers 71
Internal Drives in Servers
Supported Bus Types
Fixing Dimensions
The positions of fixing points are shown below.
If the screw length used is too long, a mechanical limitation device on half-
height drives will cause the screw to rotate without further tightening. This is to
protect the internal mechanism. If this happens, place a washer behind the
screw head (or use a shorter screw) to secure the mounting. The
recommended screw length depends on the thickness of the rails or enclosure
into which the drive is mounted:
All screws should be M3 threaded. Do not use spring washers.
The recommended mounting torque is 6.0 ±0.5 in-lbs (60–70 N/cm).
HP recommends 0.3 mm mounting clearance around all covers for isolation
mounting movement.
SCSI Bus Type Transfer Speed Supported
Ultra3 (160) LVD Up to 160 MB/s Yes. This is the recommended configuration.
Ultra4 (320) LVD Up to 320 MB/s Yes. This is the recommended configuration for more than one
drive per bus.
Ultra2 LVD Up to 80 MB/s Yes, but this will not provide optimum performance.
Single-ended, wide Up to 40 MB/s Yes, but this is not recommended as it will severely restrict performance.
Do not connect to a narrow SCSI bus.
High Voltage
Differential
Up to 40 MB/s No. The drive will not work and you may damage the drive or controller
Recommended Screw Length
Server or Rail Thickness Half-height drives Full-height drives
> 1.5 mm ≤ 2.0 mm M3 x 4.0 mm M3 x 6.0 mm
> 1.0 mm ≤ 1.5 mm M3 x 4.0 mm with 0.5 mm washer M3 x 6.0 mm
≤ 1.0 mm M3 x 3.0 mm M3 x 5.0 mm