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68 Internal Drives in Servers
equipment, all requirements of DIN VDE 0805 must be observed and
obeyed.
Note The drives are only fused to protect them from excessive
currents.
Requirements
Mounting Requirements
Drives require one industry standard 5¼-inch, full-height bay.
HP recommends 0.3 mm mounting clearance around all covers for isolation
mounting movement.
For many servers, no mounting tray or rails are required. Devices simply slide
into the computer’s chassis and are fixed with screws. Other servers have
built-in trays or rails. Yet others require a special mounting tray or rails to fix
the drive into the empty bay.
Airflow and Cooling
HP Ultrium drives require forced airflow, either from front to back or from
back to front, that satisfies the following conditions:
3
For full-height internal drives, the airflow at 35°C ambient air operation
should be at least 6 cubic feet per minute (0.17 cubic meters per minute or
10.19 cubic meters per hour) through the product. At 40°C, it should be
at least 8 ft
3
/min (0.23 m
3
/min or 13.60 m
3
/h)
These requirements and the operating temperature specification should keep
the internal temperature around the media to less than 45°C and ensure
reliable operation.
The airflow does not require filtering if the air contamination specifications
are met. See “Climatics” in Chapter 4, “Environmental Specification” in
Specifications, Volume 4 of the Ultrium Technical Reference Manual.
Caution Care must be taken that empty bays in the server have the
appropriate blanking plates installed so that airflow is
maintained. Refer to your server documentation.
How to Measure Critical Internal Drive Temperatures
The most accessible place to measure internal temperatures to ensure that
airflow is adequate is the case lid of the Formatter ASIC (U6):