Constellation SAS Product Manual, Rev. E
23
[1]
Measured with average reading DC ammeter.
[2]
Instant12V current peaks will exceed these values.
[3]
Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.
[4]
For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ±5% before reaching
7,200 RPM. The ±5% must be maintained after the drive signifies that its power-up sequence has been
completed and that the drive is able to accept selection by the host initiator.
Table 2:
500GB drive (Standard & SED model)
DC power requirements
Notes
3.0 Gbit mode
6.0 Gbit mode
(Amps)
(Amps)
(Amps)
(Amps)
Voltage
+5V
+12V [4]
+5V
+12V [4]
Regulation
[5]
±5%
±5% [2]
±5%
±5% [2]
Avg idle current DCX
[1] [7]
0.33
0.10
0.34
0.10
Advanced idle current
Idle_A
0.32
0.10
0.34
0.10
Idle_B
0.23
0.08
0.24
0.08
Idle_C/ Standby_Y
0.23
0.05
0.24
0.05
Standby_Z
0.23
0.02
0.25
0.02
Maximum starting current
(peak DC) DC
3
σ
[5]
0.59
0.65
0.60
0.65
(peak AC) AC
3
σ
[5]
0.90
0.87
0.97
1.03
Delayed motor start (max) DC
3
σ
[1] [6]
0.55
0.03
0.58
0.03
Peak operating current (random read):
Typical DCX
[1] [6]
0.41
0.14
0.43
0.14
Maximum DC
3
σ
[1]
0.44
0.15
0.46
0.14
Maximum (peak) DC
3
σ
0.98
0.54
1.04
0.54
Peak operating current (random write)
Typical DCX
0.46
0.14
0.47
0.14
Maximum DC
3
σ
0.49
0.14
0.50
0.14
Maximum (peak) DC
3
σ
1.22
0.56
1.22
0.56
Peak operating current (sequential read)
Typical DCX
0.73
0.12
0.75
0.12
Maximum DC
3
σ
0.77
0.12
0.80
0.12
Maximum (peak) DC
3
σ
1.04
0.20
1.12
0.20
Peak operating current (sequential write)
Typical DCX
0.79
0.12
0.80
0.12
Maximum DC
3
σ
0.84
0.12
0.85
0.12
Maximum (peak) DC
3
σ
1.20
0.20
1.22
0.20
