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Seagate Enterprise Capacity 2.5 HDD v3 SAS Product Manual, Rev. D 24
[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 -7.5%/+10% tolerance is allowed during initial spindle start but must return to ±5% before reaching 7,134 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 selec
-
tion by the host initiator.
[3] See +12V current profile in Figure 1 (for 2TB 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, noise, and transient response.
[6] Operating condition is defined as random 8 block reads.
[7] During idle, the drive heads are relocated every 30 seconds to a random location within the band from three-quarters to maximum
track.
General DC power requirement notes.
1. Minimum current loading for each supply voltage is not less than 1.7% of the maximum operating current shown.
2. The +5V and +12V supplies should employ separate ground returns.
3. Where power is provided to multiple drives from a common supply, careful consideration for individual drive power requirements
should be noted. Where multiple units are powered on simultaneously, the peak starting current must be available to each device.
4. Parameters, other than spindle start, are measured after a 10-minute warm up.
Table 3 1TB standard drive DC power requirements
Notes
12.0Gb mode
(Amps) (Amps) (Watts)
Voltage +5V +12V
[2]
Total
Regulation
[5]
±5% ±5%
[2]
Avg idle current DC
[1] [7]
0.37 0.12 3.29
Advanced Idle Current
Idle_A 0.37 0.12 3.29
Idle_B 0.30 0.09 2.58
Idle_C 0.30 0.06 2.22
Standby 0.28 0.01 1.52
Maximum starting current
(peak DC) DC
[3]
0.60 0.69
(peak AC) AC
[3]
0.74 0.96
Delayed motor start (max) DC
[1] [4]
0.31 0.03 1.91
Operating current (random read):
Typical DC
[1] [6]
0.46 0.30 5.90
Maximum DC
[1]
0.52 0.32 6.44
Maximum (peak) DC 1.38 0.86
Operating current (random write)
Typical DC
[1]
0.45 0.27 5.49
Maximum DC
[1]
0.50 0.34 6.58
Maximum (peak) DC 0.78 0.87
Operating current (sequential read)
Typical DC
[1]
0.65 0.15 5.05
Maximum DC
[1]
0.71 0.17 5.59
Maximum (peak) DC 0.98 0.29
Operating current (sequential write)
Typical DC
[1]
0.60 0.17 5.04
Maximum DC
[1]
0.65 0.19 5.53
Maximum (peak) DC 0.87 0.34