8
Momentus 5400.5 SATA Product Manual, Rev. B
The drive receives DC power (+5V) through a native SATA power connector.
2.9.1 Power consumption
Power requirements for the drives are listed in the table on p age 8. 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.
**Standby power is measured at steady state (afte r 200ms from transition)
Table 3: DC power
Power dissipation +5V input average (25° C)
Spinup (max) 1.0 amps
Seek 1.6 watts
Read 2.6 watts
Write 2.85 watts
Idle, performance* 1.5 watts
Idle, active* 0.78 watts
Idle, low power mode* 0.725 watts
Standby** 0.22 watts
Sleep 0.22 watts