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Savvio 15K.3 SAS Product Manual, Rev. A 25
[1] Measured with average reading DC ammeter. Instantaneous +12V current peaks will exceed these val-
ues. 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
15K 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 7.3.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and
transient response.
[6] Operating condition is defined as random 8 block reads.
[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 3: 146GB models DC power requirements
Notes
3.0 Gb mode 6.0 Gb mode
Parameter (Amps) (Amps) (Amps) (Amps)
Voltage +5V +12V [2] +5V +12V [2]
Regulation [5] ±5% ±5% [2] ±5% ±5% [2]
Avg idle current DC [1] [7] 0.36 0.17 0.36 0.17
Standby 3σ 0.28 0.05 0.27 0.04
Maximum starting current
(peak DC) DC 3σ [3] 0.67 0.86 0.67 0.86
(peak AC) AC 3σ [3] 0.91 1.74 1.01 1.60
Delayed motor start (max) DC 3σ [1] [4] 0.56 0.06 0.56 0.06
Peak operating current: (random read)
Typical DC [1] [6] 0.50 0.41 0.48 0.42
Maximum DC 3σ [1] 0.52 0.42 0.50 0.43
Maximum (peak) DC 3σ 1.37 1.25 1.29 1.24
Peak operating current: (random write)
Typical DC [1] 0.59 0.32 0.57 0.33
Maximum DC 3σ [1] 0.61 0.34 0.58 0.34
Maximum (peak) DC 3σ 1.20 1.27 1.12 1.25
Peak operating current: (sequential read)
Typical DC [1] 0.87 0.18 0.84 0.19
Maximum DC 3σ [1] 0.93 0.18 0.90 0.19
Maximum (peak) DC 3σ 1.22 0.43 1.21 0.41
Peak operating current: (sequential write)
Typical DC [1] 1.00 0.18 0.98 0.19
Maximum DC 3σ [1] 1.06 0.18 1.03 0.19
Maximum (peak) DC 3σ 1.32 0.36 1.34 0.36