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CONSTELLATION ES.1 SAS PRODUCT MANUAL, REV. G 19
6.2 AC POWER REQUIREMENTS
None.
6.3 DC POWER REQUIREMENTS
The voltage and current requirements for a single drive are shown below. Values indicated apply at the drive connector.
The standard drive models and the SED drive models have identical hardware, however the security and encryption portion of the drive
controller ASIC is enabled and functional in the SED models. This represents a small additional drain on the 5V supply of about 30mA and
a commensurate increase of about 150mW in power consumption. There is no additional drain on the 12V supply.
Table 2 2TB drive (Standard & SED model) DC power requirements
Notes
3.0Gb mode 6.0Gb mode
(Amps) (Amps)
Voltage +5V +12V [4] +5V +12V [4]
Regulation [5] ±5% ±5% [2] ±5% ±5% [2]
Avg idle current DC
X [1] [7] 0.24 0.43 0.25 0.37
Advanced idle current
Idle_A 0.36 0.42 0.36 0.42
Idle_B 0.24 0.37 0.25 0.37
Idle_C/ Standby_Y 0.24 0.20 0.25 0.20
Standby_Z 0.25 0.02 0.26 0.02
Transition current
Idle_A - Active 0.62 1.62 0.62 1.64
Idle_B - Active 0.76 1.57 0.60 1.57
Idle_C - Active 0.62 2.41 0.60 2.39
Standby - Active 0.86 2.71 0.98 2.73
Maximum starting current
(peak DC) DC 3s [5] 0.62 2.11 0.62 2.11
(peak AC) AC 3s [5] 0.86 2.70 1.02 2.72
Delayed motor start (max) DC 3s [1] [6] 0.41 0.02 0.41 0.02
Peak operating current (random read):
Typical DC
X [1] [6] 0.44 0.59 0.45 0.61
Maximum DC 3s [1] 0.47 0.61 0.48 0.64
Maximum (peak) DC 3s 1.16 1.62 1.16 1.63
Peak operating current (random write)
Typical DC
X 0.53 0.53 0.53 0.52
Maximum DC 3s 0.56 0.55 0.57 0.54
Maximum (peak) DC 3s 1.26 1.62 1.26 1.66
Peak operating current (sequential read)
Typical DC
X 0.77 0.43 0.78 0.42
Maximum DC 3s 0.81 0.45 0.82 0.44
Maximum (peak) DC 3s 1.10 0.73 1.10 0.62
Peak operating current (sequential write)
Typical DC
X 0.93 0.43 0.94 0.42
Maximum DC 3s 0.97 0.45 0.97 0.44
Maximum (peak) DC 3s 1.30 0.66 1.34 0.58