SCAN_FFS(8)             NetBSD 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 par-
                  tition if the first superblock has become corrupted.  It is
                  most useful if device refers to the raw device for the par-
                  tition, 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 fragsize/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.

NetBSD 6.0                        May 1, 2007                       NetBSD 6.0

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