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24 Savvio 10K.4 SAS Product Manual, Rev. E
[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 9,936
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 17.
[4] See +12V current profile in Figure 18.
[5] This condition occurs after OOB and Speed Negotiation completes but before the drive has received the Notify
Spinup primitive.
[6] See paragraph 7.3.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and tran-
sient response.
[7] Operating condition is defined as random 8 block reads.
[8] During idle, the drive heads are relocated every 30 seconds to a random location within the band from three-
quarters to maximum track
.
Table 3: 450GB standard model DC power requirements
Notes
450GB standard model
3.0Gb mode
450GB standard model
6.0Gb mode
(Amps) (Amps) (Amps) (Amps)
Voltage +5V +12V [2] +5V +12V [2]
Regulation [6] ±5% ±5% [2] ±5% ±5% [2]
Avg idle current DC [1] [8] 0.34 0.24 0.35 0.24
Advanced Idle Current
Idle_A 3σ 0.34 0.24 0.35 0.24
Idle_B 3σ 0.24 0.21 0.25 0.21
Idle_C 3σ 0.24 0.10 0.25 0.10
Standby 3σ 0.24 0.06 0.25 0.06
Maximum starting current
(peak DC) DC 3σ [4] 0.54 0.87 0.56 0.87
(peak AC) AC 3σ [4] 0.80 1.66 0.85 1.62
Delayed motor start (max) DC 3σ [1] [5] 0.48 0.07 0.49 0.07
Peak operating current (random read):
Typical DC [1] [7] 0.44 0.53 0.46 0.53
Maximum DC 3σ [1] 0.47 0.54 0.48 0.54
Maximum (peak) DC 3σ 1.08 1.54 1.08 1.54
Peak operating current (random write)
Typical DC 0.49 0.44 0.50 0.43
Maximum DC 3σ 0.52 0.46 0.53 0.45
Maximum (peak) DC 3σ 1.02 1.58 1.02 1.56
Peak operating current (sequential read)
Typical DC 0.86 0.27 0.87 0.27
Maximum DC 3σ 0.88 0.29 0.89 0.28
Maximum (peak) DC 3σ 1.12 0.44 1.14 0.44
Peak operating current (sequential write)
Typical DC 0.80 0.27 0.81 0.27
Maximum DC 3σ 0.85 0.29 0.86 0.28
Maximum (peak) DC 3σ 1.04 0.80 1.04 0.80