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Momentus Product Manual, Rev. B 9
3.9 Power specifications
The drive receives DC power (+5V) through a native SATA power connector.
3.9.1 Power consumption
Power requirements for the drives are listed in the table on
page 9. 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 drive spindle reaches operating speed.
• Seek mode
During seek mode, the read/write actuator arm moves towar
d a specific position on the disc surface and does
not execute a read or write operation. Servo electronics are active. Seek mode power is measured based on
three random seek operations every 100 ms. This mode is not typical.
• Read/write
power and current
Read/write power is measured with the heads on track, base
d on three 63 sector read or write operations
every 100 msecs.
• Idle mode power
Idle mode power is measured with the drive up to spee
d, 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
Table 3: DC power
ST9750423AS, ST9750423ASG,
ST9640424AS, ST9640423AS,
and ST9640423ASG,
ST9750422AS, ST9750420AS,
ST9750420ASG, ST9500424AS,
ST9500423AS and ST9500423ASG
Power dissipation +5V input average (25° C)
Spinup (max) 1.0A
Seek Average 1.9W 2.5W
Write Average 1.85W 2.4W
Read Average 1.6W 2.1W
Idle, performance* 1.4W 2.0W
Idle, active* 0.80W 0.96W
Idle, low power mode* 0.55W 0.70W
Standby 0.15W
Sleep 0.15W
*During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and
power to operational levels.