26 Savvio 10K.5 FC Product Manual, Rev. D
[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 5.
[4] See +12V current profile in Figure 6.
[5] This condition occurs when the Motor Start option is enabled and the drive has not yet received a Start Motor com-
mand.
[6] See paragraph 7.3.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and transient
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 5: DC power requirements for ST9300605FC model
2Gb 4Gb
Notes (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] 0.36 0.15 0.38 0.15
Advanced Idle Current
Idle_A 3σ 0.38 0.16 0.39 0.16
Idle_B 3σ 0.26 0.15 0.27 0.15
Idle_C 3σ 0.26 0.09 0.27 0.09
Standby 3σ 0.26 0.06 0.27 0.06
Maximum starting current
(peak DC) DC 3σ [4] 0.61 0.89 0.63 0.89
(peak AC) AC 3σ [4] 0.95 1.54 0.99 1.52
Delayed motor start (max) DC 3σ [1] [5] 0.57 0.06 0.58 0.06
Peak operating current (random read):
Typical DC [1] [7] 0.45 0.35 0.47 0.35
Maximum DC 3σ [1] 0.47 0.37 0.49 0.37
Maximum (peak) DC 3σ 1.23 1.48 1.16 1.46
Peak operating current (random write)
Typical DC 0.51 0.33 0.52 0.33
Maximum DC 3σ 0.53 0.36 0.54 0.36
Maximum (peak) DC 3σ 1.06 1.48 1.06 1.51
Peak operating current (sequential read)
Typical DC 0.81 0.14 0.83 0.14
Maximum DC 3σ 0.86 0.15 0.87 0.14
Maximum (peak) DC 3σ 1.12 0.32 1.15 0.32
Peak operating current (sequential write)
Typical DC 0.89 0.14 0.91 0.14
Maximum DC 3σ 0.94 0.15 0.95 0.14
Maximum (peak) DC 3σ 1.20 0.32 1.19 0.30
