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NAME

       unrm - disk data recovery

SYNOPSIS

       unrm [-bevV] [-f fstype] device [start-stop ...]

DESCRIPTION

       unrm  opens  the named device and copies data blocks.  By default, unrm
       copies unallocated data blocks only.

       Arguments:

       -b     With file systems that  have  logical  blocks  that  consist  of
              fragments,  don’t  insert  null-byte padding to preserve logical
              block alignment in the output.  This option is a no-op with  the
              LINUX  ext2fs  file  system,  where logical blocks and fragments
              have the same size.

       -e     Copy every block. The output should be similar to dd(1).

       -f fstype
              Specifies the file system type. The default file system type  is
              system dependent. With most UNIX systems the default type is ufs
              (Berkeley fast file system). With  Linux  the  default  type  is
              ext2fs (second extended file system).

       -v     Turn on verbose mode, output to stderr.

       -V     Turn on verbose mode, output to stdout.

       device Disk  special file, or regular file containing a disk image.  On
              UNIX systems, raw mode disk access may give  better  performance
              than  block mode disk access.  LINUX disk device drivers support
              only block mode disk access.

       start-stop ...
              Examine the specified block number or number range.  Either  the
              start,  the  stop,  or  the  -stop may be omitted.  If -b is not
              specified, the start block must be aligned to  a  logical  block
              boundary  (e.g.  a  multiple  of  8  in  the case of an FFS file
              system). With the LINUX ext2fs  file  system,  the  start  block
              number must be >= 1.

BUGS

       unrm  should  support  more  file  system  types. Right now, support is
       limited to ext2fs when built on Linux, and ufs when  built  on  Solaris
       and BSD systems.

LICENSE

       This software is distributed under the IBM Public License.

AUTHOR(S)

       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA