Seagate BarraCuda Product Manual, Rev. B
10
Drive Specifications
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
. Typical power measurements are based on an average of drives
tested, under nominal conditions, using 5.0V and 12.0V input voltage at 25°C ambient temperature. These power
measurements are done with DIPM enabled.
• Spinup current is measured from the time of power-on to the time that the drive spindle reaches operating
speed.
• Read/Write current is measured with the heads on track, based on three 64 sector read or write operations
every 100 ms.
• The drive supports three idle modes: Performance Idle mode, Active Idle mode and Low Power Idle mode.
Refer to Section 2.8.4 for power-management modes.
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.
Table 2
DC power requirements (4TB)
Power dissipation
Avg (watts 25° C)
Avg 5V typ amps
Avg 12V typ amps
Spinup
—
—
2.0
Idle, Low Power
3.20
0.07
0.238
Read/Write
5.00
0.28
0.30
Standby
0.25
0.04
0.004
Sleep
0.25
0.04
0.004
Note
Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write current.
