4.3BSD-Reno/share/man/cat8/diskpart.0

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DISKPART(8)		      1990		      DISKPART(8)



NNAAMMEE
     diskpart - calculate default disk partition sizes

SSYYNNOOPPSSIISS
     ddiisskkppaarrtt [ --pp ] [ --dd ] [ --ss size ] disk-type

DDEESSCCRRIIPPTTIIOONN
     _D_i_s_k_p_a_r_t is used to calculate the disk partition sizes based
     on the default rules used at Berkeley.  If the --pp option is
     supplied, tables suitable for inclusion in a device driver
     are produced.  If the --dd option is supplied, an entry suit-
     able for inclusion in the disk description file /_e_t_c/_d_i_s_k_t_a_b
     is generated; c.f.  _d_i_s_k_t_a_b(5).  On disks that use _b_a_d_1_4_4-
     style bad-sector forwarding, space is normally left in the
     last partition on the disk for a bad sector forwarding
     table, although this space is not reflected in the tables
     produced.	The space reserved is one track for the repli-
     cated copies of the table and sufficient tracks to hold a
     pool of 126 sectors to which bad sectors are mapped.  For
     more information, see _b_a_d_1_4_4(8).  The size of the disk may
     be limited with the --ss option, specifying the amount of the
     disk to be used.  This option is intended for other con-
     trollers that reserve some space at the end of the disk for
     bad-sector replacements or other control areas, even if not
     a multiple of cylinders.

     The disk partition sizes are based on the total amount of
     space on the disk as given in the table below (all values
     are supplied in units of sectors).  The `c' partition is, by
     convention, used to access the entire physical disk.  The
     device driver tables include the space reserved for the bad
     sector forwarding table in the `c' partition; those used in
     the disktab and default formats exclude reserved tracks.  In
     normal operation, either the `g' partition is used, or the
     `d', `e', and `f' partitions are used.  The `g' and `f' par-
     titions are variable-sized, occupying whatever space remains
     after allocation of the fixed sized partitions.  If the disk
     is smaller than 20 Megabytes, then _d_i_s_k_p_a_r_t aborts with the
     message ``disk too small, calculate by hand''.

	  Partition  20-60 MB  61-205 MB  206-355 MB  356+ MB
	  a	     15884     15884	  15884       15884
	  b	     10032     33440	  33440       66880
	  d	     15884     15884	  15884       15884
	  e	     unused    55936	  55936       307200
	  h	     unused    unused	  291346      291346


     If an unknown disk type is specified, _d_i_s_k_p_a_r_t will prompt
     for the required disk geometry information.





Printed 7/27/90               June				1






DISKPART(8)		      1990		      DISKPART(8)



SSEEEE AALLSSOO
     disktab(5), bad144(8)

BBUUGGSS
     Most default partition sizes are based on historical
     artifacts (e.g. RP06), and may result in unsatisfactory lay-
     outs.

     When using the -d flag, alternate disk names are not
     included in the output.













































Printed 7/27/90               June				2