Power Specifications; Power Consumption - Seagate ST9750423AS Product Manual

2.9 P
OWER 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 9. 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 ms. 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
Table 3 DC power
P
OWER DISSIPATION
Spinup (max)
Seek Average
Write Average
Read Average
Idle, performance*
Idle, active*
Idle, low power mode*
Standby
Sleep
*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.
M P M
OMENTUS RODUCT ANUAL
ST9750423AS, ST9750423ASG,
ST9640424AS, ST9640423AS,
and ST9640423ASG,
+5V (25° C)
INPUT AVERAGE
1.0A
1.9W
1.85W
1.6W
1.4W
0.80W
0.55W
0.15W
0.15W
, R . F
EV
ST9750422AS, ST9750420AS,
ST9750420ASG, ST9500424AS,
ST9500423AS and ST9500423ASG
2.5W
2.4W
2.1W
2.0W
0.96W
0.70W
9