FreeBSD/Linux Kernel Cross Reference
sys/include/ibm/partition.h

     /* Description of entry in partition table.  */
     #ifndef _PARTITION_H
     #define _PARTITION_H
     
     struct part_entry {
       unsigned char bootind;        /* boot indicator 0/ACTIVE_FLAG  */
       unsigned char start_head;     /* head value for first sector   */
       unsigned char start_sec;      /* sector value + cyl bits for first sector */
       unsigned char start_cyl;      /* track value for first sector  */
      unsigned char sysind;         /* system indicator              */
      unsigned char last_head;      /* head value for last sector    */
      unsigned char last_sec;       /* sector value + cyl bits for last sector */
      unsigned char last_cyl;       /* track value for last sector   */
      unsigned long lowsec;         /* logical first sector          */
      unsigned long size;           /* size of partition in sectors  */
    };
    
    #define ACTIVE_FLAG     0x80    /* value for active in bootind field (hd0) */
    #define NR_PARTITIONS   4       /* number of entries in partition table */
    #define PART_TABLE_OFF  0x1BE   /* offset of partition table in boot sector */
    
    /* Partition types. */
    #define NO_PART         0x00    /* unused entry */
    #define MINIX_PART      0x81    /* Minix partition type */
    
    #endif /* _PARTITION_H */

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