Seagate Barracuda ST3160021AS User Manual
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8
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