Seagate Surveillance HDD Product Manual, Rev. A
8
www.seagate.com
Drive Specifications
2.8
Power specifications
The drive receives DC power (+5V or +12V) through a native SATA power connector. Refer to
Figure 1 on page 15
.
2.8.1 Power consumption
Power requirements for the drives are listed in
Table 2
. Typical power measurements are based on an average of
drives tested, under nominal conditions, using 5.0V and 12.0V 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.
• 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-ms delay,
then a 16-sector read followed by a 32-ms delay.
• 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.
* Idle1. 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.
†5W IDLE with DIPLM Enabled
2.8.2 Conducted noise
Input noise ripple is measured at the host system power supply across an equivalent 80-ohm resistive load on the
+12 volt line or an equivalent 15-ohm resistive load on the +5 volt line.
• Using 12-volt power, the drive is expected to operate with a maximum of 120 mV peak-to-peak square-wave
injected noise at up to 10MHz.
• Using 5-volt power, the drive is expected to operate with a maximum of
100 mV peak-to-peak square-wave
injected noise at up to 10MHz.
Table 2 DC power requirements (3TB and 4TB)
Power dissipation
(4-disk values shown)
Avg (watts 25° C)
Avg 5V typ amps
Avg 12V typ amps
Spinup
—
—
2.0
Idle* †
5.0
0.17
0.35
Operating
7.50
0.48
0.43
Standby
0.750
0.138
0.005
Sleep
0.750
0.138
0.005
Note
Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write current.
