Seagate Cheetah 15K Product Manual page 29

Table 15: DC power requirements
300 GB
Voltage
Regulation
Avg idle current
Maximum starting current
(peak DC) DC
(peak AC) AC
Delayed motor start (max) DC
Peak operating current (random read):
Typical DC
Maximum DC
Maximum DC (peak)
Peak operating current (random write):
Typical DC
Maximum DC
Maximum DC (peak)
Peak operating current (sequential read):
Typical DC
Maximum DC
Maximum DC (peak)
Peak operating current (sequential write):
Typical DC
Maximum DC
Maximum DC (peak)
[1] Measured with average reading DC ammeter or equivalent sampling scope. 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
15,000 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.
[3] See +12V current profile in Figure 1.
[4] This condition occurs after OOB and Speed Negotiation completes but before the drive has received the
Notify Spinup primitive.
[5] See paragraph 7.2.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and
transient response.
Cheetah 15K.7 SAS Product Manual, Rev. C
3 Gbit mode
Notes (Amps)
+5V
[5] ±5%
[1] [7] 0.34
3σ [3] 0.53
3σ [3] 0.98
3σ [1] [4] 0.47
[1][6] [1] 0.41
3σ [1] 0.42
3σ 1.18
[1][6] [1] 0.48
3σ [1] 0.49
3σ 1.18
[1][6] [1] 0.91
3σ [1] 0.93
3σ 1.20
[1][6] [1] 0.89
3σ [1] 0.93
3σ 1.22
6 Gbit mode
(Amps) (Amps) (Amps)
+12V [2] +5V +12V [2]
±5% [2] ±5% ±5% [2]
0.58 0.35 0.58
1.92 0.54 1.92
3.82 0.86 3.98
0.04 0.48 0.04
0.88 0.42 0.90
0.95 0.43 0.95
2.78 1.20 2.74
0.80 0.49 0.81
0.83 0.51 0.82
2.68 1.20 2.66
0.59 0.92 0.59
0.60 0.94 0.61
0.98 1.24 1.00
0.58 0.90 0.59
0.60 0.94 0.60
0.98 1.22 0.96
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