Seagate Pipeline HD Mini Series SATA ST9250311CS - Manual (Page 14)

8 Pipeline HD Mini Series SATA Product Manual, Rev. A
2.9 Power specifications
The drive receives DC power (+5V) through a native SATA power connector.
2.9.1 Power consumption
Power requirements for the drives are listed in the table on page 8. Typical power measurements are based on
an average of drives tested, under nominal conditions, 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
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 operation. Servo electronics are active. Seek mode power is measured based on
three random seek operations every 100 msecs. This mode is not typical.
• Read/write power and current
Read/write power is measured with the heads on track, based on three 63 sector read or write operations
every 100 msecs.
• 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 model
*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.
**Standby power is measured at steady state (after 200ms from transition)
Table 3: DC power
Power dissipation +5V input average (25° C)
Spinup (max) 1 amp
Seek 1.54 watts
Read 2.6 watts
Write 2.85 watts
Idle, performance* 1.5 watts
Idle, active* 0.81 watts
Idle, low power mode* 0.67 watts
Standby** 0.35 watts
Sleep 0.35 watts