Seagate ST32000641AS ユーザーズマニュアル

Barracuda XT Series SATA Product Manual, Rev. C 

  7

The drive receives DC power (+5V or +12V) through a native SATA power connector. See Figure 1 on page 17.

Power requirements for the drives are listed in the table on page 9. Typical power measurements are based on an aver-
age of drives tested, under nominal conditions, using 5.0V and 12.0V input voltage at 25°C ambient temperature.

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

During seek mode, the read/write actuator arm moves toward a specific position on the disk surface and does not exe-
cute a read or write operation. Servo electronics are active. Seek mode power represents the worst-case power con-
sumption, using only random seeks with read or write latency time. This mode is not typical and is provided for worst-
case information.

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 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 is measured with the drive up to speed, with servo electronics active and with the heads in a random 
track location.

During standby mode, the drive accepts commands, but the drive is not spinning, and the servo and read/write elec-
tronics are in power-down mode.

Spinup

—

—

2.8 (peak)

Idle* †

6.39

0.27

0.42

Operating (average)

9.23

0.31

0.64

Standby

0.57

0.09

0.01

Sleep

0.57

0.09

0.01

*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

Drive supports PHY layer power management. When enabled, a power savings of ~300mw can be achieved in idle, 
standby and sleep modes.