2 System Board
Devices on the PCI Bus
Transfer Rates Versus Modes of Operation
to a channel, it should be in the master position (the connector that is closest to the system board, unless the markings on the cables state otherwise).
It is possible to mix a fast and a slow device, such as a hard disk drive and a a
The controller supports
Mode | 0 | 1 | 2 | 3 | 4 |
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Cycle time (ns) | 600 | 383 | 240 | 180 | 120 |
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Transfer rate (MB/s) | 3.33 | 5.22 | 8.33 | 11.1 | 16.7 |
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The three DMA modes allow the following transfer rates:
Mode | 0 | 1 | 2 |
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Cycle time (ns) | 480 | 150 | 120 |
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Transfer rate (MB/s) | 4.2 | 13.3 | 16.7 |
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Disk Capacity Versus Modes of Addressing
The amount of addressable space on a hard disk is limited by three factors: the physical size of the hard disk, the addressing limit of the IDE hardware, and the addressing limit of the BIOS. The
| Cylinders per | Heads per | Sectors per Track | Bytes per | Bytes per | |
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CHS | 64 | 16 | 1024 | 512 | 528 | M |
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ECHS | 64 | 256 | 1024 | 512 | 8.4 | G |
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LBA | - | - | 256 M (=228) | 512 | 137 G |
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