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enum {
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enum {
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    MAX_DISKS   = 2
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    MAX_DISKS   = 2
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};
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};
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/** ATA Command Register Block. */
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typedef union {
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typedef union {
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    /* Read */
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    /* Read/Write */
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    struct {
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    struct {
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        uint8_t data_port;
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        uint16_t data_port;
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        uint8_t error;
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        uint8_t sector_count;
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        uint8_t sector_count;
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        uint8_t sector_number;
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        uint8_t sector_number;
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        uint8_t cylinder_low;
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        uint8_t cylinder_low;
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        uint8_t cylinder_high;
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        uint8_t cylinder_high;
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        uint8_t drive_head;
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        uint8_t drive_head;
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        uint8_t pad_rw0;       
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    };
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    /* Read Only */
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    struct {
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        uint8_t pad_ro0;
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        uint8_t error;
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        uint8_t pad_ro1[5];
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        uint8_t status;
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        uint8_t status;
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    };
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    };
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    /* Write */
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    /* Write Only */
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    struct {
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    struct {
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        uint8_t pad0[7];
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        uint8_t pad_wo0;
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        uint8_t features;
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        uint8_t pad_wo1[5];
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        uint8_t command;
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        uint8_t command;
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    };
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    };
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} ata_cmd_t;
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} ata_cmd_t;
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typedef union {
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typedef union {