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Annotation of researchv10dc/lsys/sys/bad144.h, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Definitions needed to perform bad sector
                      3:  * revectoring ala DEC STD 144.
                      4:  *
                      5:  * The bad sector information is located in the
                      6:  * first 5 even numbered sectors of the last
                      7:  * track of the disk pack.  There are five
                      8:  * identical copies of the information, described
                      9:  * by the bad144 structure.
                     10:  *
                     11:  * Replacement sectors are allocated starting with
                     12:  * the first sector before the bad sector information
                     13:  * and working backwards towards the beginning of
                     14:  * the disk.  A maximum of 126 bad sectors are supported.
                     15:  * The position of the bad sector in the bad sector table
                     16:  * determines which replacement sector it corresponds to.
                     17:  *
                     18:  * The bad sector information and replacement sectors
                     19:  * are conventionally only accessible through the
                     20:  * 'c' file system partition of the disk.  If that
                     21:  * partition is used for a file system, the user is
                     22:  * responsible for making sure that it does not overlap
                     23:  * the bad sector information or any replacement sector.s
                     24:  */
                     25: 
                     26: #define        NBADDESC 126
                     27: 
                     28: /*
                     29:  * known to be 512 bytes long
                     30:  */
                     31: struct bad144 {
                     32:        long    bt_csn;                         /* cartridge serial number */
                     33:        unsigned short  bt_mbz;                 /* unused; should be 0 */
                     34:        unsigned short  bt_flag;                /* -1 => alignment cartridge */
                     35:        struct bt_bad {
                     36:                unsigned short  bt_cyl;         /* cylinder number of bad sector */
                     37:                unsigned short  bt_trksec;      /* track and sector number */
                     38:        } bt_bad[126];
                     39: };
                     40: 
                     41: #if KERNEL
                     42: int bad144rep();
                     43: #endif

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