Seagate ST9900805SS Savvio 10K.4 FC Product Manual - Page 29

Table 3: DC power requirements for ST9450404FC 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] 0.35 0.25 0.38 0.25 Advanced Idle Current Idle_A 3σ 0.35 0.25 0.37 0.25 Idle_B 3σ 0.25 0.22 0.27 0.22 Idle_C 3σ 0.24 0.10 0.27 0.10 Standby 3σ 0.24 0.06 0.27 0.06 Transition Current Idle_A - Active 3σ 0.76 1.54 0.78 1.54 Idle_B - Active 3σ 0.64 1.58 0.64 1.54 Idle_C - Active 3σ 0.62 1.56 0.66 1.56 Standby - Active 3σ 0.66 1.64 0.68 1.64 Maximum starting current (peak DC) DC 3σ [4] 0.54 0.89 0.56 0.89 (peak AC) AC 3σ [4] 0.86 1.64 0.88 1.64 Delayed motor start (max) DC 3σ [1] [5] 0.49 0.06 0.51 0.06 Peak operating current (random read): Typical DC [1] [7] 0.42 0.46 0.45 0.46 Maximum DC 3σ [1] 0.43 0.48 0.47 0.47 Maximum (peak) DC 3σ 1.06 1.54 1.10 1.54 Peak operatig current (random write) Typical DC 0.47 0.39 0.49 0.40 Maximum DC 3σ 0.49 0.41 0.51 0.42 Maximum (peak) DC 3σ 1.02 1.58 1.02 1.56 Peak operating current (sequential read) Typical DC 0.83 0.24 0.86 0.24 Maximum DC 3σ 0.85 0.25 0.89 0.25 Maximum (peak) DC 3σ 1.12 0.40 1.14 0.40 Peak operating current (sequential write) Typical DC 0.82 0.24 0.85 0.24 Maximum DC 3σ 0.83 0.25 0.87 0.25 Maximum (peak) DC 3σ 1.04 0.46 1.06 0.44 [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 3. Savvio 10K.4 FC Product Manual, Rev. A 23