Seagate ST380023AS Manual download pdf (Page 19)

Barracuda Serial ATA V Product Manual, Rev. B 9

2.9.1 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 nomi-

nal conditions, using 5.0V and 12.0V input voltage at 25°C ambient tempera-

ture.

• Spinup power

Spinup power is measured from the time of power-on to the time that the

drive spindle reaches operating speed.

• Seek mode

During seek mode, the read/write actuator arm moves toward a specific

position on the disc surface and does not execute a read or write opera-

tion. Servo electronics are active. Seek mode power represents the worst-

case power consumption, using only random seeks with read or write

latency time. This mode is not typical and is provided for worst-case infor-

mation.

• 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 elec-

tronics 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.

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Seagate ST380023AS Manual Page 19