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Momentus 5400 FDE.4 SATA Product Manual, Rev. C 9

2.9 Power specifications

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 table 3. Typical power measurements are based on an average

f 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 disk 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, 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

Power dissipation +5V input average (25° C)

Spinup (max) 1.0 amps

Seek 1.54 watts

Read 1.40 watts

Write 1.78 watts

Idle, performance* 1.40 watts

Idle, active* 0.78 watts

Idle, low power mode* 0.67 watts

Standby** 0.22 watts

Sleep 0.22 watts

*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.

**Standby power is measured at steady state (after 200ms from transition)

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Acer Power 5400 Handbuch Seite 15