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Drive Specifications
2.7
Power specifications
The drive receives DC power (+5V or +12V) through a native SATA power connector. Refer to Figure 1 on page 20.
2.7.1
Power consumption
Power requirements for the drives are listed in Table 2. 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.
•
Operating Power is measured following IDEMA 3 streams standard, assuming CE operating condition
•
The drive supports three idle modes: Performance Idle mode, Active Idle mode and Low Power Idle mode.
Refer to Section 2.7.4 for power-management mode.
Table 2
DC power requirements (4TB & 3TB)
Power dissipation
Avg (watts 25° C)
Avg 5V typ amps
Avg 12V typ amps
Spinup
—
—
1.8
Idle, Low Power
2.5
0.12
0.15
Operating Power
3.7
0.28
0.191
Standby
0.25
0.04
0.004
Sleep
0.25
0.04
0.004
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 sine-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 sine-wave injected noise
at up to 10MHz.
Note
Equivalent resistance is calculated by dividing the nominal voltage by the typical RMS read/write current.
Seagate SkyHawk Product Manual, Rev. A
12