User Manual
Seagate Enterprise Capacity 3.5 HDD v5 SAS Product Manual, Rev. E 25
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.
[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)
[4] This condition occurs after OOB and Speed Negotiation completes but before the drive has received the Notify Spinup primitive.
[5] See paragraph 6.3.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and transient response.
[6] During idle, the drive heads are relocated every 60 seconds to a random location within the band from three-quarters to maximum track.
Table 3 6TB drive DC power requirements
Notes
12.0Gb mode
(Amps) (Amps) (Watts)
Voltage +5V +12V [2]
Regulation [5] ± 5% [2]
Avg idle current DCX [1] [6] 0.40 0.55 8.57
Advanced idle current
Idle A 0.39 0.55 8.47
Idle B 0.32 0.48 7.28
Idle C 0.33 0.38 6.21
Standby 0.31 0.01 1.60
Maximum starting current
(peak DC) DC [3] 0.78 2.05 28.45
(peak AC) AC [3] 1.18 2.94
Delayed motor start (max) DC [1] [4] 0.34 0.02
Operating current (random read 4K16Q)
Typical DCX [1] 0.43 0.84 12.28
Maximum DC [1] 0.44 0.85
Maximum (peak) DC 1.02 2.49
Operating current (random write 4K16Q)
Typical DCX [1] 0.47 0.61 9.61
Maximum DC [1] 0.47 0.61
Maximum (peak) DC 0.78 2.44
Operating current (sequential read 64K16Q)
Typical DCX [1] 0.77 0.59 10.95
Maximum DC [1] 0.79 0.60
Maximum (peak) DC 1.05 1.06
Operating current (sequential write 64K16Q)
Typical DCX [1] 0.65 0.62 10.66
Maximum DC [1] 0.66 0.62
Maximum (peak) DC 0.80 1.82