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4.3.2 Set Features command
This command controls the implementation of various features that the drive supports. When the drive receives this command, it sets BSY, checks the contents of the Features register, clears BSY and generates an interrupt. If the value in the register does not represent a feature that the drive supports, the command is aborted.
Table 9 Set Features commands
02H | Enable write cache (default). | |
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03H | Set transfer mode (based on value in Sector Count register). | |
| Sector Count register values: | |
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| 00H | Set PIO mode to default (PIO mode 2). |
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| 01H | Set PIO mode to default and disable IORDY (PIO mode 2). |
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| 08H | PIO mode 0 |
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| 09H | PIO mode 1 |
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| 0AH | PIO mode 2 |
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| 0BH | PIO mode 3 |
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| 0CH | PIO mode 4 (default) |
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| 20H | Multiword DMA mode 0 |
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| 21H | Multiword DMA mode 1 |
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| 22H | Multiword DMA mode 2 |
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| 40H | Ultra DMA mode 0 |
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| 41H | Ultra DMA mode 1 |
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| 42H | Ultra DMA mode 2 |
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| 43H | Ultra DMA mode 3 |
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| 44H | Ultra DMA mode 4 |
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| 45H | Ultra DMA mode 5 |
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| 46H | Ultra DMA mode 6 |
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06H | Enable the PUIS feature set | |
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07H | PUIS feature set device | |
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10H | Enable use of SATA features | |
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55H | Disable read | |
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82H | Disable write cache | |
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86H | Disable the PUIS feature set | |
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90H | Disable use of SATA features | |
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AAH | Enable read | |
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F1H | Report full capacity available | |
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At
Note above.
NAS HDD Product Manual, Rev. A | 33 |