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Annotation of 42BSD/sys/h/dkbad.h, revision 1.1.1.1

1.1       root        1: /*     dkbad.h 6.1     83/07/29        */
                      2: 
                      3: /*
                      4:  * Definitions needed to perform bad sector
                      5:  * revectoring ala DEC STD 144.
                      6:  *
                      7:  * The bad sector information is located in the
                      8:  * first 5 even numbered sectors of the last
                      9:  * track of the disk pack.  There are five
                     10:  * identical copies of the information, described
                     11:  * by the dkbad structure.
                     12:  *
                     13:  * Replacement sectors are allocated starting with
                     14:  * the first sector before the bad sector information
                     15:  * and working backwards towards the beginning of
                     16:  * the disk.  A maximum of 126 bad sectors are supported.
                     17:  * The position of the bad sector in the bad sector table
                     18:  * determines which replacement sector it corresponds to.
                     19:  *
                     20:  * The bad sector information and replacement sectors
                     21:  * are conventionally only accessible through the
                     22:  * 'c' file system partition of the disk.  If that
                     23:  * partition is used for a file system, the user is
                     24:  * responsible for making sure that it does not overlap
                     25:  * the bad sector information or any replacement sector.s
                     26:  */
                     27: 
                     28: struct dkbad {
                     29:        long    bt_csn;                 /* cartridge serial number */
                     30:        u_short bt_mbz;                 /* unused; should be 0 */
                     31:        u_short bt_flag;                /* -1 => alignment cartridge */
                     32:        struct bt_bad {
                     33:                u_short bt_cyl;         /* cylinder number of bad sector */
                     34:                u_short bt_trksec;      /* track and sector number */
                     35:        } bt_bad[126];
                     36: };
                     37: 
                     38: #define        ECC     0
                     39: #define        SSE     1
                     40: #define        BSE     2
                     41: #define        CONT    3

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