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Barracuda 7200.11 Serial ATA Product Manual, Rev. B 11
Table 3: DC power requirements
*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.
Table 4: DC power requirements
*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
2.7.2 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 10 MHz.
• 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 10 MHz.
Note. Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write
current.
2.7.3 Voltage tolerance
Voltage tolerance (including noise):
5V +10% / -7.5%
12V +10% / -7.5%
Power dissipation (3-disc values shown) Avg (watts 25° C) Avg 5V typ amps Avg 12V typ amps
Spinup — — 3.0 (peak)
Idle* 7.96 0.320 0.530
Idle* (with offline activity) 9.29 0.610 0.520
Operating (40% r/w, 40% seek, 20% inop.) 11.16 0.600 0.680
Seeking (random, 20% idle) 10.42 0.500 0.660
Standby 0.99 0.150 0.020
Sleep 0.99 0.150 0.020
Power dissipation (1-disc values shown) Avg (watts 25° C) Avg 5V typ amps Avg 12V typ amps
Spinup — — 2.0 (peak)
Idle* 5.35 0.528 0.226
Idle* (with offline activity) 9.29 0.610 0.520
Operating (40% r/w, 40% seek, 20% inop.) 11.16 0.600 0.680
Seeking (random, 20% idle) 8.35 0.573 0.458
Standby 1.8 0.350 0.008
Sleep 1.8 0.350 0.008