2.0Drive specifications
Unless otherwise noted, all specifications are measured under ambient conditions, at 25°C, and nominal power. For convenience, the phrases the drive and this drive are used throughout this manual to indicate ST94011A, ST92011A, ST92811A, and ST94811A model drives.
2.1Specification summary
The specifications listed in this table are for quick reference. For details on specification measurement or defi- nition, see the appropriate section of this manual.
Table 1: | Specifications |
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Drive specification | ST94011A | ST94811A |
| ST92011A | ST92811A | |
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Formatted Gbytes (512 bytes/sector) | 40 | 40 |
| 20 | 20 | |
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Guaranteed sectors | 78,140,160 | 78,140,160 |
| 39,070,080 | 39,070,080 | |
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Bytes per sector | 512 |
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Physical read/write heads | 2 | 2 |
| 1 | 1 | |
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Discs |
| 1 | 1 |
| 1 | 1 |
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Cache (Mbytes) | 2 | 8 |
| 2 | 8 | |
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Recording density, BPI (bits/inch max) | 642,000 |
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Track density. TPI (tracks/inch max) | 100,780 |
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Areal density (Mbits/inch2 max) | 65 |
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Spindle speed (RPM) | 5,400 |
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Internal data transfer rate OD (Mbytes/sec max) | 48.25 |
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Sustained data transfer rate OD (Mbytes/sec) | 34.5 |
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I/O | 100 |
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ATA | PIO modes | |||||
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Height |
| 9.5 |
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Width |
| 69.85 |
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Length |
| 100.2 |
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Weight (typical) | 99 grams (0.218 lb.) |
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Average latency (msec) | 5.6 |
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3.9 |
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Standby to ready (sec typical) | 2.6 sec |
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Startup current 5V (peak) | 1.2 amps |
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1.5 (read), 2.0 (write) |
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Average seek time (msec typical) | 12.0 |
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Average seek, read (msec typical) | 12.0 |
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Average seek, write (msec typical) | 14.0 |
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Momentus 5400.1 Product Manual, Rev. F | 3 |