Table of Contents
Advertisement
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 3
8TB and 6TB drive DC power requirements
Voltage
Regulation
Avg idle current DCX
Advanced idle current
Idle A
Idle B
Idle C
Standby
Maximum starting current
(peak DC) DC
(peak AC) AC
Delayed motor start (max) DC
Operating current (random read 4K16Q)
Typical DCX
Maximum DC
Maximum (peak) DC
Operating current (random write 4K16Q)
Typical DCX
Maximum DC
Maximum (peak) DC
Operating current (sequential read 64K16Q)
Typical DCX
Maximum DC
Maximum (peak) DC
Operating current (sequential write 64K16Q)
Typical DCX
Maximum DC
Maximum (peak) DC
[1]
Measured with average reading DC ammeter. Instantaneous +12V current peaks will exceed these values. Power supply at nominal voltage. N
(number of drives tested) = 6, 35 Degrees C ambient.
[2]
For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ± 5% before reaching 7200 RPM. The ± 5% must be main-
tained after the drive signifies that its power-up sequence has been completed and that the drive is able to accept selection by the host initia-
tor.
[3]
See +12V current profile in Figure 1. (for 4TB models)
Seagate Exos 7E8 SAS Product Manual, Rev.A
12.0Gb mode
Notes
(Amps)
(Amps)
+5V
+12V [2]
[5]
± 5% [2]
[1] [6]
0.40
0.55
0.39
0.55
0.32
0.48
0.33
0.38
0.31
0.01
[3]
0.78
2.05
[3]
1.18
2.94
[1] [4]
0.34
0.02
[1]
0.43
0.84
[1]
0.44
0.85
1.02
2.49
[1]
0.47
0.61
[1]
0.47
0.61
0.78
2.44
[1]
0.77
0.59
[1]
0.79
0.60
1.05
1.06
[1]
0.65
0.62
[1]
0.66
0.62
0.80
1.82
(Watts)
8.57
8.47
7.28
6.21
1.60
28.45
12.28
9.61
10.95
10.66
25
Advertisement
Table of Contents
