Seagate ST4000DM001 ユーザーズマニュアル

The drive receives DC power (+5V or +12V) through a native SATA power connector. Refer to 

Power requirements for the drives are listed in 

. Typical power measurements are based on an average of 

drives tested, under nominal conditions, using 5.0V and 12.0V input voltage at 25°C ambient temperature.

• Spinup power

Spinup power is measured from the time of power-on to the time that the drive spindle reaches operating 
speed.

• Read/write power and current

Read/write power is measured with the heads on track, based on a 16-sector write followed by a 32-ms delay,
then a 16-sector read followed by a 32-ms delay.

• 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.

†5W IDLE with DIPLM Enabled

Input noise ripple is measured at the host system power supply across an equivalent 80-ohm resistive load on the 
+12 volt line or an equivalent 15-ohm resistive load on the +5 volt line.

• Using 12-volt power, the drive is expected to operate with a maximum of 120 mV peak-to-peak square-wave

injected noise at up to 10MHz.

• Using 5-volt power, the drive is expected to operate with a maximum of

 

100 mV peak-to-peak square-wave

injected noise at up to 10MHz.

Spinup

—

—

2.0

Idle* †

5.0

0.17

0.35

Operating

7.50

0.48

0.43

Standby

0.750

0.138

0.005

Sleep

0.750

0.138

0.005