block.h

enum {
    DISK_INIT = 100,
    DISK_GETINFO,
    DISK_SEEKSET,
    DISK_SEEKCUR,
    DISK_SEEKEND,
    DISK_FINISH
};

struct blk_info {
    uint16_t num_cylinders;
    uint16_t num_heads;
    uint16_t sectors_track;
    uint32_t num_sectors;       // mandatory
    uint16_t bytes_sector;      // mandatory
    uint16_t media_desc;
};