Seagate NAS HDD +SRS Product Manual, Rev. C
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* 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.
2.8.3 Voltage tolerance
Voltage tolerance (including noise):
• 5V ±5%
• 12V ±10%
Table 2
DC power requirements (2TB)
Power dissipation (2-disk values
shown)
Avg (watts 25°C)
Avg 5V typ amps
Avg 12V typ amps
Spinup
—
—
2.0
Idle* †
3.0
0.229
0.162
Operating
4.30
0.308
0.233
Standby
0.30
0.053
0.004
Sleep
0.30
0.053
0.004
Table 3
DC power requirements (4TB)
Power dissipation (4-disk values
shown)
Avg (watts 25° C)
Avg 5V typ amps
Avg 12V typ amps
Spinup
—
—
2.0
Idle* †
3.95
0.116
0.28
Operating
4.80
0.288
0.283
Standby
0.50
0.09
0.005
Sleep
0.50
0.09
0.005
Note
Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write current.
