Momentus 4200.2 Product Manual, Rev. C
9
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 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 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 mode.
*During periods of drive i dle, some offline activity may occur accord in g t o t he S.M .A. R. T. speci ficati on , w hich ma y increase acoustic and
power to operational levels.
Time to ready Typical Max @ 25°C
Power-on to Ready (sec) 3.5 8.0
Standby to Ready (sec) 3.0 8. 0
Table 2: DC power
Power dissipation +5V Average (25° C)
Spinup (typical) 1.0 amps
Seek 2.00 watts
Read 1.80 watts
Write 1.80 watts
Idle, performance mode* 1.70 watts
Idle, active* 0.99 watts
Idle, low power mode* 0.80 watts
Standby 0.26 watts
Sleep 0.26 watts