Table 14: 450 GB DC power requirements
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| ST3450857SS | ST3450857SS | ||||
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| ST3450757SS | ST3450757SS | ||||
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| 3 Gbit mode |
| 6 Gbit mode |
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| Notes | (Amps) |
| (Amps) | (Amps) |
| (Amps) | |
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Voltage |
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| +5V |
| +12V [2] | +5V |
| +12V [2] |
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Regulation |
| [5] |
| ±5% |
| ±5% [2] | ±5% |
| ±5% [2] |
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Avg idle current |
| [1] [7] |
| 0.39 |
| 0.68 | 0.41 |
| 0.66 |
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Maximum starting current |
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(peak DC) DC | 3σ | [3] |
| 0.65 |
| 1.94 | 0.67 |
| 1.94 |
(peak AC) AC | 3σ | [3] |
| 0.94 |
| 3.91 | 0.96 |
| 3.89 |
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Delayed motor start (max) DC | 3σ | [1] [4] |
| 0.54 |
| 0.04 | 0.56 |
| 0.04 |
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Peak operating current (random read): |
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Typical DC | [1][6] | [1] |
| 0.45 |
| 1.01 | 0.47 |
| 1.02 |
Maximum DC | 3σ | [1] |
| 0.48 |
| 1.08 | 0.51 |
| 1.06 |
Maximum DC (peak) | 3σ |
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| 1.28 |
| 2.90 | 1.30 |
| 2.84 |
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Peak operating current (random write): |
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Typical DC | [1][6] | [1] |
| 0.52 |
| 0.90 | 0.55 |
| 0.89 |
Maximum DC | 3σ | [1] |
| 0.56 |
| 0.93 | 0.58 |
| 0.91 |
Maximum DC (peak) | 3σ |
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| 1.24 |
| 2.78 | 1.26 |
| 2.84 |
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Peak operating current (sequential read): |
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Typical DC | [1][6] | [1] |
| 0.98 |
| 0.69 | 1.03 |
| 0.67 |
Maximum DC | 3σ | [1] |
| 1.04 |
| 0.70 | 1.10 |
| 0.68 |
Maximum DC (peak) | 3σ |
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| 1.36 |
| 1.10 | 1.44 |
| 1.10 |
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Peak operating current (sequential write): |
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Typical DC | [1][6] | [1] |
| 0.95 |
| 0.69 | 0.98 |
| 0.67 |
Maximum DC | 3σ | [1] |
| 0.99 |
| 0.70 | 1.02 |
| 0.68 |
Maximum DC (peak) | 3σ |
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| 1.26 |
| 1.10 | 1.30 |
| 1.12 |
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Cheetah 15K.7 SAS Product Manual, Rev. A | 21 |
