2 conducted noise, 3 voltage tolerance – Seagate BARRACUDA 7200.11 User Manual

Page 17

Barracuda 7200.11 Serial ATA Product Manual, Rev. B

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