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disktab(5) [bsd man page]

DISKTAB(5)							File Formats Manual							DISKTAB(5)

NAME
disktab - disk description file SYNOPSIS
#include <disktab.h> DESCRIPTION
Disktab is a simple date base which describes disk geometries and disk partition characteristics. The format is patterned after the term- cap(5) terminal data base. Entries in disktab consist of a number of `:' separated fields. The first entry for each disk gives the names which are known for the disk, separated by `|' characters. The last name given should be a long name fully identifying the disk. The following list indicates the normal values stored for each disk entry. Name Type Description ns num Number of sectors per track nt num Number of tracks per cylinder nc num Total number of cylinders on the disk b0 str Filename of block zero primary bootstrap for device ba num Block size for partition `a' (bytes) bd num Block size for partition `d' (bytes) be num Block size for partition `e' (bytes) bf num Block size for partition `f' (bytes) bg num Block size for partition `g' (bytes) bh num Block size for partition `h' (bytes) fa num Fragment size for partition `a' (bytes) fd num Fragment size for partition `d' (bytes) fe num Fragment size for partition `e' (bytes) ff num Fragment size for partition `f' (bytes) fg num Fragment size for partition `g' (bytes) fh num Fragment size for partition `h' (bytes) pa num Size of partition `a' in sectors pb num Size of partition `b' in sectors pc num Size of partition `c' in sectors pd num Size of partition `d' in sectors pe num Size of partition `e' in sectors pf num Size of partition `f' in sectors pg num Size of partition `g' in sectors ph num Size of partition `h' in sectors se num Sector size in bytes (default 512) sf bool supports bad144-style bad sector forwarding so bool partition offsets in sectors ty str Type of disk (e.g. removable, winchester) Disktab entries may be automatically generated with the diskpart program. FILES
/etc/disktab SEE ALSO
newfs(8), diskpart(8), getdiskbyname(3) BUGS
This file shouldn't exist, the information should be stored on each disk pack. 4.2 Berkeley Distribution May 17, 1986 DISKTAB(5)

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creatediskbyname(3x)													      creatediskbyname(3x)

Name
       creatediskbyname - get the disk description associated with a file name

Syntax
       #include <disktab.h>

       struct disktab *
       creatediskbyname(name)
       char *name;

Description
       The subroutine takes the name of the character device special file representing a disk device (for example, and returns a structure pointer
       describing its geometry information and the default disk partition tables.  It obtains this information by  polling  the  controlling  disk
       device driver.  The subroutine returns information only for MSCP and SCSI disks.

       The file has the following form:
       #define DISKTAB	      "/etc/disktab"

       struct  disktab {
	     char   *d_name;	      /* drive name */
	     char   *d_type;	      /* drive type */
	     int    d_secsize;	      /* sector size in bytes */
	     int    d_ntracks;	      /* # tracks/cylinder */
	     int    d_nsectors;       /* # sectors/track */
	     int    d_ncylinders;     /* # cylinders */
	     int    d_rpm;	      /* revolutions/minute */
	     struct partition {
		     int     p_size;   /* #sectors in partition */
		     short   p_bsize;  /* block size in bytes */
		     short   p_fsize;  /* frag size in bytes */
	       } d_partitions[8];
       };

       struct  disktab *getdiskbyname();
       struct  disktab *creatediskbyname();

Diagnostics
       Successful completion of the subroutine returns a pointer to a valid disktab structure.	Failure of this subroutine returns a null pointer.
       The subroutine fails if it cannot obtain the necessary information from the device driver or disktab file.

       A check is done to ensure that the disktab file exists and is readable.	This check ensures that the subroutine is not being called because
       the disktab file was accidentally removed.  If there is no disktab file, the subroutine fails.

       The subroutine also fails if it cannot determine disk geometry attributes by polling the driver.  This can occur if the disk is not an MSCP
       or SCSI disk.  In some cases where the disk consists of removable media and the media is not loaded, the driver will be unable to determine
       disk attributes.

Restrictions
       The subroutine returns information only for MSCP and SCSI disks.

See Also
       getdiskbyname(3x), ra(4), rz(4), disktab(5)

															      creatediskbyname(3x)
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