Conducted Noise; Voltage Tolerance - Seagate BARRACUDA ST31000524AS Product Manual

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Table 4 DC power requirements (2-disk)
Power dissipation (2-disk values shown)
Spinup
Idle* †
Idle* † (with offline activity)
Operating
Standby
Sleep
Table 5 DC power requirements (1-disk)
Power dissipation (1-disk values shown)
Spinup
Idle* †
Idle* † (with offline activity)
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.
†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.
Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write
Note
current.

2.8.3 Voltage tolerance

Voltage tolerance (including noise):
• 5V +10% / -7.5%
• 12V +10% / -7.5%
Barracuda SATA Product Manual, Rev. B
Avg (watts 25° C) Avg 5V typ amps
— —
5.0 0.168
5.40 0.153
6.57 0.496
0.79 0.35
0.79 0.35
Avg (watts 25° C) Avg 5V typ amps
— —
4.60 0.378
4.50 0.250
6.19 0.656
0.79 0.35
0.79 0.35
Drive Specifications
Avg 12V typ amps
2.0 (peak)
0.337
0.387
0.341
0.01
0.01
Avg 12V typ amps
2.0 (peak)
0.224
0.240
0.243
0.01
0.01
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