Savvio 15K.2 SAS Product Manual, Rev. E 23
[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 7.2.1, "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: 73GB models DC power requirements
Notes
3.0 Gbit mode 6.0 Gbit mode
(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 0.18 0.37 0.18
Maximum starting current
(peak DC) DC 3σ[3] 0.51 1.09 0.51 1.08
(peak AC) AC 3σ[3] 0.93 1.73 0.99 1.86
Delayed motor start (max) DC 3σ[1] [4] 0.56 0.06 0.57 0.05
Peak operating current: (random read)
Typical DC [1] [6] 0.45 0.36 0.46 0.36
Maximum DC 3σ[1] 0.47 0.37 0.48 0.37
Maximum (peak) DC 3σ1.16 1.16 1.14 1.16
Peak operating current: (random write)
Typical DC [1] 0.52 0.28 0.53 0.28
Maximum DC 3σ[1] 0.55 0.28 0.56 0.28
Maximum (peak) DC 3σ1.14 1.18 1.16 1.20
Peak operating current: (sequential read)
Typical DC [1] 0.88 0.18 0.89 0.18
Maximum DC 3σ[1] 0.92 0.19 0.93 0.19
Maximum (peak) DC 3σ1.18 0.40 1.20 0.42
Peak operating current: (sequential write)
Typical DC [1] 0.88 0.18 0.89 0.18
Maximum DC 3σ[1] 0.94 0.19 0.95 0.19
Maximum (peak) DC 3σ1.16 0.40 1.18 0.40