Drive Specifications | www.seagate.com |
2.3Recording and interface technology
| ST33000651AS | ST32000641AS |
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Interface | SATA | SATA |
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Recording method | Perpendicular | Perpendicular |
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Recording density (kbits/inch max) | 1941kb/in | 1721kb/in |
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Track density (ktracks/inch avg) | 277 ktracks/in | 240 ktracks/in |
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Areal density (Gbits/inch2 avg) | 488Gb/in2 | 347Gb/in2 |
Spindle speed (RPM) | 7200 + 0.2% | 7200 + 0.2% |
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Internal data transfer rate | 1900Mb/s | 1300Mb/s |
(Mb/s max) |
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Sustained data transfer rate | 149MB/s | 138MB/s |
(MB/s max) |
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I/O | 600MB/s | 600MB/s |
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2.4Physical characteristics
| ST33000651AS | ST32000641AS |
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Maximum height | 26.1mm / 1.028 in | 26.1mm / 1.028 in |
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Maximum width | 101.85mm / 4.010 in | 101.85mm / 4.010 in |
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Maximum length | 146.99mm / 5.787 in | 146.99mm / 5.787 in |
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Typical weight | 700g / 1.543 lb | 700g / 1.543 lb |
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Cache buffer | 64MB (64,768kb) | 64MB (64,768kb) |
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2.5 Start/stop times
| 3000GB | 2000GB |
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18.0 | 15.0 | |
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Standby to ready (s) max. | 18.0 | 15.0 |
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Ready to spindle stop (s) max. | 20.0 | 20.0 |
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2.6Power specifications
The drive receives DC power (+5V or +12V) through a native SATA power connector. See Figure 5 on page 24. Power 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
• Seek mode
During seek mode, the read/write actuator arm moves toward a specific position on the disk surface and does not execute a read or write operation. Servo electronics are active. Seek mode power represents the worst-
12 | Barracuda XT SATA Product Manual, Rev. D |