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Rev 4530 Rev 4531
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    ER_ABRT     = 0x04, /**< Aborted Command */
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    ER_ABRT     = 0x04, /**< Aborted Command */
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    ER_TK0NF    = 0x02, /**< Track 0 Not Found */
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    ER_TK0NF    = 0x02, /**< Track 0 Not Found */
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    ER_AMNF     = 0x01  /**< Address Mark Not Found */
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    ER_AMNF     = 0x01  /**< Address Mark Not Found */
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};
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};
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enum ata_command {
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    CMD_IDENTIFY_DRIVE  = 0xEC,
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    CMD_READ_SECTORS    = 0x20,
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    CMD_WRITE_SECTORS   = 0x30
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};
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typedef struct {
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typedef struct {
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    bool present;
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    bool present;
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    unsigned heads;
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    unsigned heads;
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    unsigned cylinders;
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    unsigned cylinders;
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    unsigned sectors;
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    unsigned sectors;