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Sprite 1984 - 1993
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Sprite 1984 - 1993.iso
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netBoot.new
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dkbad.h
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C/C++ Source or Header
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1990-12-19
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1KB
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43 lines
/* @(#)dkbad.h 1.1 86/09/27 SMI; from UCB 4.3 81/05/10 */
/*
* 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