Unix/Linux Go Back    

Plan 9 - man page for prep (plan9 section 8)

Linux & Unix Commands - Search Man Pages
Man Page or Keyword Search:   man
Select Man Page Set:       apropos Keyword Search (sections above)

PREP(8) 										  PREP(8)

       prep, format - prepare hard and floppy diskettes

       disk/prep [ -ra ] special [ type ]

       disk/format [ -t type ] [ -f ] [ -d ] [ -b bfile ] [ -c csize ] [ -l label ] drive [ files
       ... ]

       A partition table is stored on a hard disk to specify the division of  the  physical  disk
       into  a	set  of logical units.	On Plan 9 the partition table is a list of triples: name,
       starting sector, and ending sector.  The kernel fabricates the first two partitions,  disk
       and  partition;	the  disk partition records the starting and ending sectors for the whole
       disk, and the partition partition, typically the last sector on the disk, holds the parti-
       tion table itself.

       Special	is  the  maximal  prefix  of  names of the logical units on the disk, for example
       #w/hd0.	Prep reads and prints the associated partition table and  then	enters	a  simple
       interactive mode to control editing the table.

       The options are:

       -r     (read only) prohibits writing the table on disk.

       -a     automatically  create  default  partitions  if  no  partition table already exists.
	      These include partitions for DOS, a boot kernel, an NVRAM substitute, a kfs(4) file
	      system, and, if room remains, a swap partition.

       Format  prepares  for  use  the	floppy diskette in the disk file named drive, for example
       /dev/fd0disk.  The options are:

       -f     Do not physically format the disc. Used to install an MS-DOS filesystem on a previ-
	      ously formatted disc. With this option, drive can be a plain file.

       -t     specify a density and type of disk to be prepared.  The possible types are:

	      31/2DD 31/2" double density, 737280 bytes

	      31/2HD 31/2" high density, 1474560 bytes

	      51/4DD 51/4" double density, 368640 bytes

	      51/4HD 51/4"  high density, 1146880 bytes

	      The default is the highest possible on the device, unless -f is used, in which case
	      the default is 31/2HD.

       -d     add MS-DOS parameter block, file access table (FAT),  and  root  directory  to  the
	      start of the floppy.

       The remaining options have effect only when -d is specified:

       -b     use the contents of bfile as the bootstrap block installed in sector 0.

       -c     use a DOS cluster size of csize sectors when creating the DOS FAT.

       -l     add a label when creating the DOS parameter block.

       Again  under -d, any files listed are added, in order, to the root directory of the MS-DOS
       filesytem.  The files are contiguously allocated and created with the  READONLY	attribute

       The  file  /sys/src/boot/pc/bb  is  an example of a suitable bfile to make the disk a boot
       disk.  It gets loaded by the BIOS at 0x7C00, reads the root directory into address 0x7E00,
       and looks at the first root directory entry.  If that file is called B.COM, it uses single
       sector reads to load the file into address 0x10000 and  then  jumps  to	the  loaded  file

       Create a Plan 9 boot floppy on a previously formatted diskette:

	      disk/format -f -b bb -d /dev/fd0disk /386/b.com


       floppy(3), wren(3), b.com(8)

Unix & Linux Commands & Man Pages : ©2000 - 2018 Unix and Linux Forums

All times are GMT -4. The time now is 03:44 PM.