Seagate SV35.5 - Series 250 GB Hard Drive, Product Manual

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10 SV35.5 Series SATA Product Manual, Rev. A
2.8 Power specifications
The drive receives DC power (+5V or +12V) through a native SATA power connector. See Figure 1 on page 20.
2.8.1 Power 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.
2.8.2 DC power requirements
• Power supply tol5V DC +/-5%
• Power supply tol10V 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
2.8.3 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.