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Momentus 5400.3 PATA Blade Server Product Manual, Rev. B
The drive receives DC power (+5V) through the interface connector.
2.9.1 Power consumption
Power requirements for the drives are listed in the table on page 12. Typical power measurements are based
on an average of drives tested, under nominal conditions, at 25°C ambient temperature.
• Spinup power
Spinup power is measured from the time of power -on to the time that the dr ive spindle reaches opera ting speed.
• Seek mode
During seek mode, the read/write actuator arm moves towar d a specif ic position o n the disc surfa ce and does
not execute a read or write operation. Servo electronics are active. Seek mode power is measure d based on
three random seek operations every 100 msecs. This mode is not typical.
•Read/write power and current
Read/write power is measured with the heads on track, based on three 63 sector read or write operations
every 100 msecs.
• Idle mode power*
Idle mode power is measured with the drive up to speed, with servo electronics active and with the heads in
a random track location.
• Standby mode
During Standby mode, the drive accepts commands, but the drive is not spinning, and the servo and read/
write electronics are in power-down model
*During periods of drive idle, some offline activity may occur accordin g to the S.M.A.R .T. specifica tion, whi ch may incre ase acoustic an d
power to operational levels.
Table 2: DC power for 2 disk models
Power dissipation +5V average (25° C)
Spinup (typical) 1.0 amps
Seek 2.0 watts
Read 2.0 watts
Write 1.8 watts
Idle, performance 1.7 watts
Idle, active* 0.99 watts
Idle, low power mode* 0.8 watts
Standby 0.2 watts
Sleep 0.2 watts