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Cheetah 15K.7 SAS Product Manual, Rev. D 23
[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.
Table 16: 300 GB DC power requirements
Notes
3 Gbit mode 6 Gbit mode
(Amps) (Amps) (Amps) (Amps)
Voltage +5V +12V [2] +5V +12V [2]
Regulation [5] ±5% ±5% [2] ±5% ±5% [2]
Avg idle current [1] [7] 0.34 0.58 0.35 0.58
Maximum starting current
(peak DC) DC 3σ [3]0.531.920.541.92
(peak AC) AC 3σ [3]0.983.820.863.98
Delayed motor start (max) DC 3σ [1] [4] 0.47 0.04 0.48 0.04
Peak operating current (random read):
Typical DC [1][6] [1] 0.41 0.88 0.42 0.90
Maximum DC 3σ [1]0.420.950.430.95
Maximum DC (peak) 3σ 1.18 2.78 1.20 2.74
Peak operating current (random write):
Typical DC [1][6] [1] 0.48 0.80 0.49 0.81
Maximum DC 3σ [1]0.490.830.510.82
Maximum DC (peak) 3σ 1.18 2.68 1.20 2.66
Peak operating current (sequential read):
Typical DC [1][6] [1] 0.91 0.59 0.92 0.59
Maximum DC 3σ [1]0.930.600.940.61
Maximum DC (peak) 3σ 1.20 0.98 1.24 1.00
Peak operating current (sequential write):
Typical DC [1][6] [1] 0.89 0.58 0.90 0.59
Maximum DC 3σ [1]0.930.600.940.60
Maximum DC (peak) 3σ 1.22 0.98 1.22 0.96