8
Momentus 5400.2 Product Manual, Rev. D
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 p age 8 . Typical power measurements are based on
an average of drives tested, under nominal conditions, using 5.0V input voltage 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
Power dissipation +5V average (watts, 25° C)
Spinup (typical) 1.00 amps
Idle, performance mode* 1.85
Idle, active* 0.99
Idle, low power mode* 0.85
Seeking 2.3
Read 2.05
Write 2.1
Standby 0.20
Sleep 0.20