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Annotation of 43BSD/sys/h/dkbad.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1982, 1986 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  *
        !             6:  *     @(#)dkbad.h     7.1 (Berkeley) 6/4/86
        !             7:  */
        !             8: 
        !             9: /*
        !            10:  * Definitions needed to perform bad sector
        !            11:  * revectoring ala DEC STD 144.
        !            12:  *
        !            13:  * The bad sector information is located in the
        !            14:  * first 5 even numbered sectors of the last
        !            15:  * track of the disk pack.  There are five
        !            16:  * identical copies of the information, described
        !            17:  * by the dkbad structure.
        !            18:  *
        !            19:  * Replacement sectors are allocated starting with
        !            20:  * the first sector before the bad sector information
        !            21:  * and working backwards towards the beginning of
        !            22:  * the disk.  A maximum of 126 bad sectors are supported.
        !            23:  * The position of the bad sector in the bad sector table
        !            24:  * determines which replacement sector it corresponds to.
        !            25:  *
        !            26:  * The bad sector information and replacement sectors
        !            27:  * are conventionally only accessible through the
        !            28:  * 'c' file system partition of the disk.  If that
        !            29:  * partition is used for a file system, the user is
        !            30:  * responsible for making sure that it does not overlap
        !            31:  * the bad sector information or any replacement sector.s
        !            32:  */
        !            33: 
        !            34: struct dkbad {
        !            35:        long    bt_csn;                 /* cartridge serial number */
        !            36:        u_short bt_mbz;                 /* unused; should be 0 */
        !            37:        u_short bt_flag;                /* -1 => alignment cartridge */
        !            38:        struct bt_bad {
        !            39:                u_short bt_cyl;         /* cylinder number of bad sector */
        !            40:                u_short bt_trksec;      /* track and sector number */
        !            41:        } bt_bad[126];
        !            42: };
        !            43: 
        !            44: #define        ECC     0
        !            45: #define        SSE     1
        !            46: #define        BSE     2
        !            47: #define        CONT    3

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