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2.8 Power specifications
The drive receives DC power (+5V or +12V) through a native SATA power connector. Refer to
2.8.1 Power consumption
Power requirements for the drives are listed in
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 by simulating a typical PVR operating environment, using a 50% write, 50% read algo-
rithm.
• 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 elec-
tronics are in power-down mode.
Table 2
DC power requirements (3TB and 4TB)
Power dissipation (3-disk values shown)
Spinup
Idle2* †
Operating
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.
† 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.
Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write current.
Note
2.8.3 Voltage tolerance
Voltage tolerance (including noise):
• 5V ±5%
• 12V ±10%
Seagate NAS HDD and NAS +SRS HDD Product Manual, Rev. E
. Typical power measurements are based on an average of drives
Table 2
Avg (watts 25° C)
—
3.20
5.50
0.25
0.25
Drive Specifications
Figure 1 on page 21
Avg 5V typ amps
Avg 12V typ amps
—
<=1.8 (peak)
0.07
0.238
0.20
0.33
0.04
0.004
0.04
0.004
.
11
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