Power Consumption - Seagate ST3780A Product Manual

10
• Idle. The heads are parked in the shipping zone. The spindle is
spinning, the cache buffer remains enabled and the drive accepts all
commands and returns to the Seeking or Read/write modes when it
receives a command that requires disc access.
• Standby. The spindle is stopped, the heads are parked in the landing
zone, the actuator is latched and some of the drive electronics are
powered down. The drive reports to the computer that it is ready to
access the disc. When the drive receives a command that does not
require disc access, the drive remains in the Standby mode. When
the drive receives a command that requires disc access, it spins up
and performs the command.

1.11.5 Power consumption

In the table below, the values apply at the drive power connector. Current
was measured with an RMS DC ammeter.
Spinup
Current at +12V
Amps peak
1.9
RMS amps typ
—
Watts typ
—
Current at +5V
RMS amps typ
—
Watts typ
—
Power
Total watts typ
7.00
Medalist Family AT Product Manual, Rev. A
Read/
Seeking write Idle
— —
0.398 0.185
4.77 2.22
0.360 0.404
1.80 2.02
6.60 4.50
Standby
— —
0.118 0.012
1.41 0.144
0.225 0.164
1.12 0.82
2.75 1.0