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DISKTAB(5)	    UNIX Programmer's Manual	       DISKTAB(5)



[1mNAME
     [0mdisktab - disk description file

[1mSYNOPSIS
     #include <disktab.h>

DESCRIPTION
     [0m_D_i_s_k_t_a_b is a simple data base which describes disk
     geometries and disk partition characteristics.  The format
     is patterned after the _t_e_r_m_c_a_p(5) terminal data base.
     Entries in _d_i_s_k_t_a_b 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.

     [1mName  Type  Description
     [0mns    num	 Number of sectors per track
     nt    num	 Number of tracks per cylinder
     nc    num	 Total number of cylinders on the disk
     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
     rm    num	 Revolutions per minute of media
     sf    bool  supports bad144-style bad sector forwarding
     so    bool  partition offsets in sectors
     ty    str	 Type of disk (e.g. removable, winchester)

     A [1mp[0mx entry will be dynamically determined by _n_e_w_f_s(8) if it
     is left undefined and the corresponding [1mb[0mx entry is defined.




Printed 22/10/92    Revision 1.6 of 27/05/89			1






DISKTAB(5)	    UNIX Programmer's Manual	       DISKTAB(5)



[1mFILES
     [0m/etc/disktab

[1mSEE ALSO
     [0mnewfs(8), getdiskbyname(3)

[1mBUGS
     [0mThis file shouldn't exist, the information should be stored
     on each disk pack.














































Printed 22/10/92    Revision 1.6 of 27/05/89			2



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