Power Specifications; Power Consumption - Seagate Momentus 7200.1 PATA ST910021A Product Manual

2.9

Power specifications

The drive receives DC power (+5V) through the interface connector.
2.9.1

Power consumption

Power requirements for the drives are listed in the Table 2 on page 8. Typical power measurements are based
on an average of drives tested, under nominal conditions, using 5.0V 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 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.
• 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 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 mode.
Table 2: DC power
Power dissipation (watts)
Spinup, typical
Idle, performance mode
Idle, active
Idle, low power mode
Seeking
Read
Write
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.
8
Average (watts, 25° C)
—
2.0
1.3
0.95
2.6
2.2
2.4
0.26
0.26
5V typ amps
1.1
Momentus 7200.1 PATA Product Manual, Rev. C