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Cheetah 15K.6 SAS Product Manual, Rev. A
[1] Measured with average reading DC ammeter or equivalent sampling scope. 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
Table 3: ST3300656SS DC power requirements
Notes
ST3300656SS
1.5 Gbit mode
ST3300656SS
3 Gbit mode
(Amps) (Amps) (Amps) (Amps)
Voltage +5V +12V [2] +5V +12V [2]
Regulation [5] ±5% ±5% [2] ±5% ±5% [2]
Avg idle current DCX
[1] [7] 0.56 0.66 0.58 0.69
Maximum starting current
(peak DC) DC 3σ [3] 0.74 1.78 0.90 1.80
(peak AC) AC 3σ [3] 0.86 4.00 1.14 4.31
Delayed motor start (max) DC 3σ [1] [4] 0.56 0.03 0.62 0.03
Peak operating current:
Typical DCX
[1][6] 0.60 1.05 0.63 1.07
Maximum DC 3σ [1] 0.61 1.07 0.64 1.09
Maximum (peak) DC 3σ 1.12 2.64 1.40 2.74
Table 4: ST3146356SS DC power requirements
Notes
ST3146356SS
1.5 Gbit mode
ST3146356SS
3 Gbit mode
(Amps) (Amps) (Amps) (Amps)
Voltage +5V +12V [2] +5V +12V [2]
Regulation [5] ±5% ±5% [2] ±5% ±5% [2]
Avg idle current DCX
[1] [7] 0.53 0.56 0.55 0.57
Maximum starting current
(peak DC) DC 3σ [3] 0.89 1.69 0.88 1.67
(peak AC) AC 3σ [3] 1.13 3.72 1.14 3.88
Delayed motor start (max) DC 3σ [1] [4] 0.56 0.04 0.58 0.04
Peak operating current:
Typical DCX
[1][6] 0.57 0.95 0.60 0.95
Maximum DC 3σ [1] 0.58 0.96 0.60 0.96
Maximum (peak) DC 3σ 1.14 2.46 1.16 2.46