2.1Formatted capacity
Model | Formatted | Guaranteed | Bytes per sector | |
capacity* | sectors | |||
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ST31500341AS | 1500 Gbytes | 2,930,277,168 | 512 | |
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ST31000333AS | 1000 Gbytes | 1,953,525,168 | 512 | |
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ST3640323AS | 640 Gbytes | 1,250,263,728 | 512 | |
ST3640623AS | ||||
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ST3320613AS | 320 Gbytes | 625,142,448 | 512 | |
ST3320813AS | ||||
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ST3160813AS | 160 Gbytes | 312,581,808 | 512 | |
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*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment and formatting.
2.1.1LBA mode
When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to
See Section 4.3.1, "Identify Device command" (words
2.2Default logical geometry
Cylinders | Read/write heads | Sectors per track |
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16,383 | 16 | 63 |
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LBA mode
When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to
2.3Recording and interface technology
| ST31500341AS | ST31000333AS | ST3640323AS | ST3320613AS | ST3160813AS |
| ST3640623AS | ST3320813AS | |||
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Interface | Serial ATA (SATA) |
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Recording method | Perpendicular |
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Recording density | 1462 | 1300 | 1250 |
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(kbits/inch max) |
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Track density | 190 | 182 |
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(ktracks/inch avg) |
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Areal density | 277 | 228 | 219 |
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(Gbits/inch2 avg) |
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Spindle speed (RPM) | 7,200 ± 0.2% |
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Internal data transfer rate | 1709 | 1520 | 1460 |
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(Mbits/sec max) |
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Sustained data transfer rate | 135 | 120 | 115 |
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(Mbytes/sec max) |
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I/O | 300 |
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(Mbytes/sec max) |
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10 | Barracuda 7200.11 Serial ATA Product Manual, Rev. C |