Table 4: | Drive specifications summary for 250 Gbyte models | |
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Drive specification | ST3250820SCE | |
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Formatted Gbytes (512 bytes/sector)* | 250 | |
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Guaranteed sectors | 488,397,168 | |
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Bytes per sector | 512 | |
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Default sectors per track | 63 | |
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Default read/write heads | 16 | |
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Default cylinders | 16,383 | |
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Recording density, max | 813 kbits/in | |
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Track density, max | 145 ktracks/in | |
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Areal density, max | 114.4 Gbits/in2 | |
Spindle speed | 7,200 RPM | |
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Internal data transfer rate, max | 1,030 Mbits/sec | |
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Sustained data transfer rate, max | 72 Mbytes/sec | |
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I/O | 300 Mbytes/sec | |
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ATA | PIO modes | |
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| Multiword DMA modes |
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| Ultra DMA modes |
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Cache buffer |
| 8 Mbytes |
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Height, max |
| 26.1 mm (1.028 inches) |
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Width, max |
| 101.6 mm (4.000 inches) +/- 0.010 inches |
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Length, max |
| 146.99 mm (5.787 inches) |
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Weight, typical | 580 grams (1.28 lb.) | |
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Average latency | 4.16 msec | |
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16 sec | ||
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Standby to ready, max | 16 sec | |
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<0.8 msec read; <1.0 msec write | ||
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Average seek, read, typical | <11.0 msec | |
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Average seek, write, typical | <12.0 msec | |
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Startup current (max) 12V (peak) | 2.0 amps | |
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Voltage tolerance (including noise) | 5V ± 5% | |
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| 12V ± 10% |
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Ambient temperature | 0° to 65°C (operating) | |
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Temperature gradient, per hour max | 20°C (operating) | |
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| 30°C (nonoperating) |
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Relative humidity | 5% to 90% (operating) | |
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| 5% to 95% (nonoperating) |
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Relative humidity gradient, per hour max | 30% | |
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Wet bulb temperature, max | 37.7°C (operating) | |
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| 37.7°C (nonoperating) |
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Altitude, operating | ||
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Altitude, nonoperating, max | ||
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Operational Shock, max | 63 Gs at 2 msec | |
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350 Gs at 2 msec | ||
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Vibration, operating | ||
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10 | DB35.3 Series Serial ATA Product Manual, Rev. D |