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CHEETAH 15K.7 SAS PRODUCT MANUAL, REV. F 20
[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 6.2.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and transient
response.
[6] Operating condition is defined as random 8 block reads at 375 I/Os per second for 600GB models, and 380 I/Os per
second for 450GB and 300GB models. Current and power specified at nominal voltages.
[7] During idle, the drive heads are relocated every 60 seconds to a random location within the band from three-quarters to
maximum track.
Table 5 300 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] 0.53 1.92 0.54 1.92
(peak AC) AC 3σ [3] 0.98 3.82 0.86 3.98
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] 0.42 0.95 0.43 0.95
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] 0.49 0.83 0.51 0.82
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] 0.93 0.60 0.94 0.61
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] 0.93 0.60 0.94 0.60
Maximum DC (peak) 3σ 1.22 0.98 1.22 0.96