User Manual

Constellation.2 SAS Product Manual, Rev. K 30
Table 3: 500GB drive (Standard & SED model) DC power requirements
[1] Measured with average reading DC ammeter.
[2] Instantaneous +12V current peaks will exceed these values.
[3] Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.
[4] For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ±5% before reaching 7,200
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.
[5] See +12V current profile in Figure 1.
[6] This condition occurs after OOB and Speed Negotiation completes but before the drive has received the Notify
Spinup primitive.
[7] See paragraph 6.3.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and tran-
sient response.
[8] Operating condition is defined as random 8 block reads.
[9] During idle, the drive heads are relocated every 30 seconds to a random location within the band from three-
quarters to maximum track.
Parameter
Voltage Notes +5 V +12 V [4] Power +5 V +12 V [4] Power
Regulation [5] (watts) (watts)
Average Idle Current [1] [7] 0.38 0.10 3.15 0.39 0.10 3.19
Advanced Idle Current
Idle1 0.38 0.10 3.17 0.39 0.11 3.20
Idle2 0.28 0.09 2.46 0.29 0.09 2.50
Idle3 0.28 0.07 2.22 0.29 0.07 2.25
Standby 0.28 0.04 1.89 0.29 0.04 1.92
Maximum Start Current:
DC (Peak DC) 3σ [5] 0.69 0.78 12.88 0.72 0.78 12.99
AC (Peak AC) 3σ [5] 0.83 1.19 18.36 0.87 1.19 18.58
Delayed Motor Start (DC max) 3σ [1] [6] 0.50 0.04 3.01 0.51 0.05 3.12
Peak Operating Current (random read):
Typical DC [1] [6] 0.51 0.25 5.51 0.51 0.24 5.48
Maximum DC 3σ [1] 0.53 0.25 5.67 0.53 0.25 5.67
Maximum DC (peak) 3σ 1.22 0.84 16.18 1.22 0.84 16.18
Peak Operating Current (random write):
Typical DC 0.62 0.22 5.71 0.62 0.22 5.70
Maximum DC 3σ 0.64 0.22 5.87 0.64 0.22 5.88
Maximum DC (peak) 3
σ
1.04 0.84 15.28 1.06 0.82 15.14
Peak operating current (sequential read):
Typical DC 0.81 0.12 5.49 0.81 0.12 5.49
Maximum DC 3σ 0.84 0.12 5.66 0.83 0.12 5.63
Maximum DC (peak) 3σ 0.98 0.26 8.02 1.02 0.26 8.22
Peak operating current (sequential write):
Typical DC 0.93 0.12 6.09 0.93 0.12 6.07
Maximum DC 3σ 0.95 0.12 6.22 0.96 0.12 6.24
Maximum DC (peak) 3σ 1.08 0.28 8.76 1.16 0.28 9.16
(3.0GB) (6.0GB)
+/-5% [2] +/-5% [2]
ST9500620SS ST9500620SS