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3 Electrical requirements
PSU requirements
Internal and rack-mounted drives
The drives are specified to operate at 5V±5% and 12V±10%. Any PSU used to power the
drive must be capable of providing 5V nominal (when the drive pulls 5A on the 5V rail) and
12V nominal (when the drive pulls 2A on the 12V rail). HP recommends a 10% buffer when
selecting a power supply source capable of delivering the amperage and power required.
* The current values are calculated based on constant power and minimum power supply voltage.
Power consumption
SCSI Drives FC Drives
Specification 5V 12V 5V 12V
Maximum voltage 5.25V 13.2V 5.25V 13.2V
Minimum voltage 4.75V 10.8V 4.75V 10.8V
Maximum steady-state current 4.75*A 1.0A 4.75*A 1.0A
Maximum transient current 4.75*A 2.0A 4.75*A 2.0A
Maximum steady-state power 22.5W 12W 17.5W
12W
Maximum transient power 22.5W 24W 22.5W 24W
Maximum noise/ripple 150 mVpp 150 mVpp 150 mVpp 150 mVpp
Internal Drives External Drives
Power Requirements <40W 100–240 VAC 50/60 Hz 0.8A max.
5V DC 3.0A typical (4.5A max.)
12V DC 0.8A typical (2.0A max.)
SCSI Drives FC Drives
Activity Average Peak Average
Idle
15.8W 15.8W TBD
Load
18.1W 32.3W TBD
Write
30.2W 35.3W TBD
