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Momentus 7200.1 PATA Product Manual, Rev. C
2.9 Power specifications
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 2 on page 8. Typical power measurements are based
on an average of drives tested, under nominal conditions, using 5.0V input voltage at 25°C ambient tempera-
ture.
• 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 toward 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 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.
• Operating power and current
Operating power is measured using 40 percent random seeks, 40 percent read/write mode (1 write for each
10 reads) and 20 percent drive idle mode.
• 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 idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and
power to operational levels.
Table 2: DC power
Power dissipation (watts) Average (watts, 25° C) 5V typ amps
Spinup, typical — 1.1
Idle, performance mode 2.0
Idle, active 1.3
Idle, low power mode 0.95
Seeking 2.6
Read 2.2
Write 2.4
Standby 0.26
Sleep 0.26