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Seagate Barracuda ST3160021AS User Manual

Page 16

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Barracuda 7200.7 Serial ATA Product Manual, Rev. N

• 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.

[1]

NCQ may not be enabled during power measurements.

[2]

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 4:

DC power requirements (example of 160GB models supporting NCQ

[1]

)

Power dissipation (watts)

Average
(watts, 25° C)

5V typ
amps

12V typ amps

Spinup

2.8 (peak)

Idle

7.5

0.487

0.422

Idle (with offline activity)

[2]

9.3

0.875

0.41

Operating (40% r/w, 40% seek, 20% inop.)

12.0

0.631

0.737

Seeking

12.5

0.405

0.873

Standby/Sleep

1.0

0.185

0.006

Table 5:

DC power requirements (example of 160GB and 200GB models not supporting NCQ)

Power dissipation (watts)

Average
(watts, 25° C)

5V typ
amps

12V typ amps

Spinup

2.8 (peak)

Idle

7.5

0.482

0.424

Idle (with offline activity)

[2]

9.3

0.587

0.53

Operating (40% r/w, 40% seek, 20% inop.)

12.1

0.638

0.739

Seeking

12.5

0.412

0.87

Standby/Sleep

2.0

0.367

0.014

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