Seagate ST310014ACE manual Power specifications, Power consumption

6 ST310014ACE Product Manual, Rev. D

Note. These drives are designed to meet the seek times represented in this manual consistently. Physical seeks, regardless of mode (such as track-to-track and average), are expected to meet or exceed the noted values. However, due to the manner in which these drives are formatted, benchmark tests that include com- mand overhead or measure logical seeks may produce results that vary from these specifications.

1.7 Power specifications

The drive receives DC power (+5V or +12V) through a four-pin standard drive power connector.

1.7.1 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 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.

•Seek Mode

The read/write actuator arm moves in a random seek mode, with 80% of the time spent seeking randomly among all the logical blocks, and 20% of the time idle. The current is measured over a 10-second period. No data is read or written during this test.

•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

The read/write actuator arm moves in a random read/write mode, with 80% of the time spent seeking, reading, and writing randomly among all the logical blocks, and 20% of the time idle. The current is measured over a 10-second period.

•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