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10 Constellation Serial ATA Product Manual, Rev. D
3.8 Power specifications
The drive receives DC power (+5V or +12V) through a native SATA power connector. See Figure 4, page 22 on
page 22.
3.8.1 Power consumption
Power requirements for the drives are listed in the table on page 9. Typical power measurements are based on
a
n 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.
• Standby mode
During Standby mode, the drive accepts commands, but th
e drive is not spinning, and the servo and read/
write electronics are in power-down mode.
Table 2: DC power requirements
Parameter
Voltage +5 V +12 V Power +5 V +12 V Power
Regulation +/-5% +/-5% (watts) +/-5% +/-5
%
(watts)
Average Idle Current 0.28 0.11 2.69 0.29 0.11 2.71
Advanced Idle Current
Idle_A 0.24 0.10 2.42 0.24 0.10 2.45
Idle_B 0.14 0.08 1.71 0.15 0.08 1.72
Idle_C 0.14 0.05 1.37 0.15 0.05 1.38
Standby 0.16 0.02 1.05 0.17 0.02 1.06
Average Sleep Current 0.16 0.02 1.06 0.16 0.02 1.03
Maximum Start Current:
DC (Peak DC) 0.39 0.64 9.64 0.40 0.65 9.77
AC (Peak AC) 0.73 1.50 21.59 0.72 1.55 22.25
Delayed Motor Start (DC max) 0.16 0.03 1.12 0.17 0.02 1.08
Peak Operating Current (random read):
Typical DC 0.29 0.13 3.05 0.30 0.14 3.11
Maximum DC 0.29 0.15 3.22 0.30 0.15 3.30
Maximum DC (peak) 0.84 0.52 10.44 0.84 0.56 10.92
Peak Operating Current (random write):
Typical DC 0.34 0.14 3.42 0.35 0.14 3.49
Maximum DC 0.36 0.14 3.50 0.36 0.15 3.59
Maximum DC (peak) 1.02 0.58 12.06 1.02 0.60 12.30
Peak operating current (sequential read):
Typical DC 0.58 0.12 4.27 0.58 0.12 4.33
Maximum DC 0.59 0.12 4.35 0.60 0.12 4.44
Maximum DC (peak) 0.82 0.22 6.74 0.84 0.22 6.84
Peak operating current (sequential write):
Typical DC 0.63 0.12 4.52 0.64 0.12 4.59
Maximum DC 0.67 0.12 4.77 0.68 0.12 4.84
Maximum DC (peak) 1.04 0.20 7.60 1.06 0.20 7.70
ST9500530NS ST9500530NS
(1.5GB) (3.0GB)
*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.