Barracuda ATA IV Family Product Manual, Rev. B 9
•
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
.
1.7.1.1 Typical current profile
Figure 1. Typical startup and operation current profile
Power dissipation
(watts, ST380021A, 2-disc)
Average
(watts, 25° C)
5V typ
amps
12V typ
amps
Spinup — 1.2 2.8 (peak)
Idle 8.0 0.837 0.317
Idle* (with offline activity) 9.8 1.02 0.389
Operating 40% r/w.
40% seek, 20% inop. 12.5 0.76 0.725
Seeking 13.0 0.575 0.844
Standby 1.15 0.202 0.012
Sleep 0.9 0.151 0.012
Current (amps)
-0.5
0
0.5
1
1.5
2
2.5
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0
Time (seconds)
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