3.8Power specifications
The drive receives DC power (+5V or +12V) through a native SATA power connector. See Figure 4, page 22 on page 22.
3.8.1Power consumption
Power requirements for the drives are listed in the table on page 9. Typical power measurements are based on an average of drives tested, under nominal conditions, using 5.0V and 12.0V input voltage at 25°C ambient temperature.
• Spinup power
Spinup power is measured from the time of
• Standby mode
During Standby mode, the drive accepts commands, but the drive is not spinning, and the servo and read/ write electronics are in
Table 2: | DC power requirements |
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| ST9500530NS |
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| ST9500530NS |
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| Parameter |
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| (1.5GB) |
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| (3.0GB) |
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| Voltage |
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| +5 V |
| +12 V |
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| Power | +5 V |
| +12 V |
| Power | |
| Regulation |
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| (watts) |
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| (watts) | |||||
| Average Idle Current | 0.28 |
| 0.11 |
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| 2.69 | 0.29 |
| 0.11 |
| 2.71 | ||
| Advanced Idle Current |
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| Idle_A |
| 0.24 |
| 0.10 |
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| 2.42 | 0.24 |
| 0.10 |
| 2.45 | |
| Idle_B |
| 0.14 |
| 0.08 |
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| 1.71 | 0.15 |
| 0.08 |
| 1.72 | |
| Idle_C |
| 0.14 |
| 0.05 |
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| 1.37 | 0.15 |
| 0.05 |
| 1.38 | |
| Standby |
| 0.16 |
| 0.02 |
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| 1.05 | 0.17 |
| 0.02 |
| 1.06 | |
| Average Sleep Current | 0.16 |
| 0.02 |
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| 1.06 | 0.16 |
| 0.02 |
| 1.03 | ||
| Maximum Start Current: |
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| DC (Peak DC) |
| 0.39 |
| 0.64 |
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| 9.64 | 0.40 |
| 0.65 |
| 9.77 | |
| AC (Peak AC) | 0.73 |
| 1.50 |
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| 21.59 | 0.72 |
| 1.55 |
| 22.25 | ||
| Delayed Motor Start (DC max) | 0.16 |
| 0.03 |
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| 1.12 | 0.17 |
| 0.02 |
| 1.08 | ||
| Peak Operating Current (random read): |
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| Typical DC |
| 0.29 |
| 0.13 |
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| 3.05 | 0.30 |
| 0.14 |
| 3.11 | |
| Maximum DC | 0.29 |
| 0.15 |
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| 3.22 | 0.30 |
| 0.15 |
| 3.30 | ||
| Maximum DC (peak) | 0.84 |
| 0.52 |
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| 10.44 | 0.84 |
| 0.56 |
| 10.92 | ||
| Peak Operating Current (random write): |
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| Typical DC |
| 0.34 |
| 0.14 |
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| 3.42 | 0.35 |
| 0.14 |
| 3.49 | |
| Maximum DC | 0.36 |
| 0.14 |
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| 3.50 | 0.36 |
| 0.15 |
| 3.59 | ||
| Maximum DC (peak) | 1.02 |
| 0.58 |
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| 12.06 | 1.02 |
| 0.60 |
| 12.30 | ||
| Peak operating current (sequential read): |
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| Typical DC |
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| 0.58 |
| 0.12 |
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| 4.27 | 0.58 |
| 0.12 |
| 4.33 |
| Maximum DC | 0.59 |
| 0.12 |
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| 4.35 | 0.60 |
| 0.12 |
| 4.44 | ||
| Maximum DC (peak) | 0.82 |
| 0.22 |
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| 6.74 | 0.84 |
| 0.22 |
| 6.84 | ||
| Peak operating current (sequential write): |
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| Typical DC |
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| 0.63 |
| 0.12 |
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| 4.52 | 0.64 |
| 0.12 |
| 4.59 |
| Maximum DC | 0.67 |
| 0.12 |
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| 4.77 | 0.68 |
| 0.12 |
| 4.84 | ||
| Maximum DC (peak) | 1.04 |
| 0.20 |
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| 7.60 | 1.06 |
| 0.20 |
| 7.70 | ||
*During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and power to operational levels.
10 | Constellation Serial ATA Product Manual, Rev. D |
