4.3BSD - /usr/src/sys/h/dkbad.h

   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

Defined struct's

Defined macros

Usage of this include