Table 2: | Drive specifications summary for 640 Gbyte models |
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Drive specification | ST3640330AS | ST3640630AS | |
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Formatted capacity (512 bytes/sector)* | 640 Gbytes |
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Guaranteed sectors | 1,250,284,896 |
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Heads |
| 6 |
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Discs |
| 3 |
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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 | 1090 kbits/in max |
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Track density |
| 150 ktracks/in avg |
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Areal density |
| 164 Gbits/in2 avg |
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Spindle speed |
| 7,200 RPM |
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Internal data transfer rate | 1287 Mbits/sec max |
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Sustained data transfer rate OD | 105 Mbytes/sec max |
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I/O | 300 Mbytes/sec max |
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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 |
| 32 Mbytes | 16 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) | 633 grams ( 1.396 lb.) |
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Average latency | 4.16 msec |
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20 sec max |
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Standby to ready | 15 sec max |
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<1.0 msec typical read; |
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| <1.2 msec typical write |
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Average seek, read | <8.5 msec typical |
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Average seek, write | <9.5 msec typical |
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Startup current (typical) 12V (peak) | 3.0 amps |
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Voltage tolerance (including noise) | 5V +10% / |
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| 12V +10% / |
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Ambient temperature | 0° to 60°C per hour max (operating) |
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Temperature gradient | 20°C per hour max (operating) |
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| 30°C per hour max (nonoperating) |
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Relative humidity | 5% to 95% (operating) |
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| 5% to 95% (nonoperating) |
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Relative humidity gradient | 30% per hour max |
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Wet bulb temperature | 37.7°C max (operating) |
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| 40.0°C max (nonoperating) |
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Altitude, operating |
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Altitude, nonoperating |
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(below mean sea level, max) |
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Operational Shock | 63 Gs max at 2 msec |
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300 Gs max at 2 msec |
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6 | Barracuda 7200.11 Serial ATA Product Manual, Rev. G |