Seagate ST3250311SV manual Power specifications, Power consumption, Spinup power, Idle mode power

2.8Power specifications

The drive receives DC power (+5V or +12V) through a native SATA power connector. See Figure 1 on page 20.

2.8.1Power consumption

Power requirements for the drives are listed in the table on page 9. 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.

• Spinup power

Spinup power is measured from the time of power-on to the time that the drive spindle reaches operating speed.

• Idle mode power

Idle mode power is measured with the drive up to speed, with servo electronics active and with the heads in a random track location.

• Operating

Operating power is measured by simulating a typical PVR operating environment, using a 50% write 50% read algorithm.

• Standby mode

During Standby mode, the drive accepts commands, but the drive is not spinning, and the servo and read/ write electronics are in power-down mode.

2.8.2DC power requirements

•Power supply tolerance +5V DC +/-5%

•Power supply tolerance +10V DC +/-10%

•Startup current (A, max.) 2.0

•Idle (W) 7 (1TB/500GB); 5 (250GB)

•Operating Power (W) 10.4 (1TB/500GB); 8 (250GB)

•Standby power (W) 1.0

2.8.3Conducted 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.

10 SV35.5 Series SATA Product Manual, Rev. A