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/*
* Mach Operating System
* Copyright (c) 1989 Carnegie-Mellon University
* All rights reserved. The CMU software License Agreement specifies
* the terms and conditions for use and redistribution.
*/
/*
* HISTORY
* $Log: dkbad.h,v $
* Revision 2.3 89/03/09 22:03:23 rpd
* More cleanup.
*
* Revision 2.2 89/02/25 17:52:50 gm0w
* Changes for cleanup.
*
*/
/*
* Copyright (c) 1982, 1986 Regents of the University of California.
* All rights reserved. The Berkeley software License Agreement
* specifies the terms and conditions for redistribution.
*
* @(#)dkbad.h 7.1 (Berkeley) 6/4/86
*/
#ifndef _SYS_DKBAD_H_
#define _SYS_DKBAD_H_
#import <sys/types.h>
/*
* Definitions needed to perform bad sector
* revectoring ala DEC STD 144.
*
* The bad sector information is located in the
* first 5 even numbered sectors of the last
* track of the disk pack. There are five
* identical copies of the information, described
* by the dkbad structure.
*
* Replacement sectors are allocated starting with
* the first sector before the bad sector information
* and working backwards towards the beginning of
* the disk. A maximum of 126 bad sectors are supported.
* The position of the bad sector in the bad sector table
* determines which replacement sector it corresponds to.
*
* The bad sector information and replacement sectors
* are conventionally only accessible through the
* 'c' file system partition of the disk. If that
* partition is used for a file system, the user is
* responsible for making sure that it does not overlap
* the bad sector information or any replacement sector.s
*/
struct dkbad {
long bt_csn; /* cartridge serial number */
u_short bt_mbz; /* unused; should be 0 */
u_short bt_flag; /* -1 => alignment cartridge */
struct bt_bad {
u_short bt_cyl; /* cylinder number of bad sector */
u_short bt_trksec; /* track and sector number */
} bt_bad[126];
};
#define ECC 0
#define SSE 1
#define BSE 2
#define CONT 3
#endif
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