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NetBSD 6.1.5 - man page for scan_lfs (netbsd section 8)

SCAN_FFS(8)			   BSD System Manager's Manual			      SCAN_FFS(8)

NAME
     scan_ffs, scan_lfs -- find FFSv1/FFSv2/LFS partitions on a disk or file

SYNOPSIS
     scan_ffs [-blv] [-e end] [-F file] [-s start] device

DESCRIPTION
     scan_ffs will take a raw disk device that covers the whole disk or a file and will find all
     possible FFSv[12]/LFS partitions, independent of block sizes on it.  It will show the file
     system type (FFSv1, FFSv2, or LFS), size, and offset.  Also it has an option to show the
     values with a disklabel-alike output.

     The options are as follows:

     -b 	  Report every superblock found with its sector address, rather than trying to
		  report the partition boundaries.  This option can be useful to find the other
		  superblocks in a partition if the first superblock has become corrupted.  It is
		  most useful if device refers to the raw device for the partition, rather than
		  the entire disk.

     -e end	  Where to stop searching for file systems.  The end argument specifies the last
		  sector that will be searched.  Default is the last sector of device.

     -F file	  Path to a file containing possible partitions inside of it.

     -l 	  Print out a string looking much like the input to disklabel.	With a little
		  massaging, this output can usually be used by disklabel(8).

     -s start	  Where to start searching for file systems.  This makes it easier to skip swap
		  partitions or other large non-UFS/FFS partitions.  The start argument specifies
		  the first sector that will be searched.  Default is the first sector of device.

     -v 	  Be verbose about what scan_ffs is doing, and what has been found.

     The device argument specifies which device scan_ffs should scan for file systems.

     scan_lfs is just another name for the same program, both behave in exactly the same way.

SEE ALSO
     disklabel(8)

HISTORY
     The scan_ffs program first appeared in OpenBSD 2.3 and then in NetBSD 3.1.  Support for
     searching in files was added in NetBSD 4.0.

AUTHORS
     scan_ffs was written for OpenBSD by Niklas Hallqvist and Tobias Weingartner.  It was ported
     to NetBSD by Juan Romero Pardines, who added support for LFS/FFSv2, partitions with frag-
     size/blocksize greater than 2048/16384 for FFSv1, searching on files, etc.

BUGS
     Currently scan_ffs won't find partitions with fragsize/blocksize greater than 8192/65536.

BSD					   May 1, 2007					      BSD


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