Seagate BARRACUDA ST3160318AS User Manual download pdf (Page 19)

Barracuda 7200.12 Serial ATA Product Manual, Rev. B 13

2.7 Power specifications

The drive receives DC power (+5V or +12V) through a native SATA power connector. See Figure 2 on page 22.

2.7.1 Power consumption

Power requirements for the drives are listed in the table on page 9. 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-msec

delay, then a 16-sector read followed by a 32-msec 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.

Table 4: DC power requirements

Table 5: DC power requirements

*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

Power dissipation (2-disc values shown) Avg (watts 25° C) Avg 5V typ amps Avg 12V typ amps

Spinup — — 2.0 (peak)

Idle* † 5.0 0.168 0.337

Idle* † (with offline activity) 5.40 0.153 0.387

Operating 6.57 0.496 0.341

Standby 0.79 0.35 0.01

Sleep 0.79 0.35 0.01

Power dissipation (1-disc values shown) Avg (watts 25° C) Avg 5V typ amps Avg 12V typ amps

Spinup — — 2.0 (peak)

Idle* † 4.60 0.378 0.224

Idle* † (with offline activity) 4.50 0.250 0.240

Operating 6.19 0.656 0.243

Standby 0.79 0.35 0.01

Sleep 0.79 0.35 0.01

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Seagate BARRACUDA ST3160318AS User Manual Page 19