U4 Family Product Manual, Rev. D | 5 |
1.0 Drive 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 the U4 ST38421A, ST36421A, ST34311A and the ST32112A.
1.1 Formatted capacity
Drive Model | Guaranteed Mbytes | Guaranteed | Bytes per |
| (1 Mbyte = 106 bytes) | sectors | sector |
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ST38421A | 8,440 | 16,498,944 | 512 |
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ST36421A | 6,448 | 12,596,850 | 512 |
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ST34311A | 4,320 | 8,452,080 | 512 |
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ST32112A | 2,160 | 4,225,536 | 512 |
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1.1.1 Default logical geometry
CHS Mode | Cylinders | Read/Write heads | Sectors per track |
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ST38421A | 16,368 | 16 | 63 |
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ST36421A | 13,330 | 15 | 63 |
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ST34311A | 8,944 | 15 | 63 |
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ST32112A | 4,192 | 16 | 63 |
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LBA Mode
When addressing either drive in LBA mode, all blocks (sectors) are consecutively numbered from 0 to
1.2 Physical organization
Drive Model | Read/Write heads (MR) | Number of discs |
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ST38421A | 4 | 2 |
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ST36421A | 3 | 2 |
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ST34311A | 2 | 1 |
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ST32112A | 1 | 1 |
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