Seagate Enterprise Performance - 3.5 HDD SAS Product Manual, Rev. B
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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 10mA and a commensurate
increase of about 50mW in power consumption. There is no additional drain on the 12V supply.
Operation at 6 Gb mode reduces the +5V supply load by 20mA with a commensurate power reduction of 100mW.
Note
There is no measurable impact to the 12V supply load when running at lower interface speeds.
Table 1
4TB drive DC power consumption
Notes
12.0Gb mode
(Amps)
(Amps)
(Watts)
Voltage
+5V
+12V
Total
Regulation
[5]
± 5%
± 5%
[2]
Avg idle current DCX
0.31
0.63
9.13
Advanced idle current
Idle A
0.31
0.63
9.07
Idle B
0.25
0.56
7.91
Idle C
0.25
0.20
3.65
Standby
0.23
0.00
1.20
Maximum starting current
(peak DC) DC
0.84
2.29
(peak AC) AC
1.20
3.28
Delayed motor start (max) DC
0.33
0.08
2.68
Operating current (random read):
Typical DC
0.39
0.94
13.24
Maximum DC
0.43
0.99
13.99
Maximum (peak) DC
1.27
2.70
Operating current (random write)
Typical DC
0.34
0.90
12.50
Maximum DC
0.39
0.93
13.13
Maximum (peak) DC
0.66
2.41
Operating current (sequential read)
Typical DC
0.77
0.65
11.64
Maximum DC
0.81
0.67
12.08
Maximum (peak) DC
1.48
1.15
Operating current (sequential write)
Typical DC
0.49
0.67
10.45
Maximum DC
0.54
0.69
11.04
Maximum (peak) DC
0.93
1.18
