ddrescue man page on DragonFly

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DDRESCUE(1)			 User Commands			   DDRESCUE(1)

NAME
       ddrescue - data recovery tool

SYNOPSIS
       ddrescue [options] infile outfile [logfile]

DESCRIPTION
       GNU  ddrescue - Data recovery tool.  Copies data from one file or block
       device to another, trying to rescue the good parts  first  in  case  of
       read errors.

       You  should  use	 a logfile unless you know what you are doing.	If you
       reboot, check the device names before restarting ddrescue.  Do not  use
       options '-F' or '-G' without reading the manual first.

OPTIONS
       -h, --help
	      display this help and exit

       -V, --version
	      output version information and exit

       -a, --min-read-rate=<bytes>
	      minimum read rate of good areas in bytes/s

       -A, --try-again
	      mark non-split, non-trimmed blocks as non-tried

       -b, --sector-size=<bytes>
	      sector size of input device [default 512]

       -B, --binary-prefixes
	      show binary multipliers in numbers [SI]

       -c, --cluster-size=<sectors>
	      sectors to copy at a time [128]

       -C, --complete-only
	      do not read new data beyond logfile limits

       -d, --direct
	      use direct disc access for input file

       -D, --synchronous
	      use synchronous writes for output file

       -e, --max-errors=[+]<n>
	      maximum number of [new] error areas allowed

       -E, --max-error-rate=<bytes>
	      maximum allowed rate of read errors per second

       -f, --force
	      overwrite output device or partition

       -F, --fill-mode=<types>
	      fill given type blocks with infile data (?*/-+)

       -G, --generate-mode
	      generate approximate logfile from partial copy

       -H, --test-mode=<file>
	      set map of good/bad blocks from given logile

       -i, --input-position=<bytes>
	      starting position in input file [0]

       -I, --verify-input-size
	      verify input file size with size in logfile

       -K, --skip-size=<min>[,<max>]
	      initial size to skip on read error [64 KiB]

       -l, --logfile-size=<entries>
	      do not grow logfile beyond this size [10000]

       -L, --loose-domain
	      accept an incomplete domain logfile

       -m, --domain-logfile=<file>
	      restrict domain to finished blocks in file

       -M, --retrim
	      mark all failed blocks as non-trimmed

       -n, --no-split
	      skip the splitting phase

       -N, --no-trim
	      skip the trimming phase

       -o, --output-position=<bytes>
	      starting position in output file [ipos]

       -O, --reopen-on-error
	      reopen input file after every read error

       -p, --preallocate
	      preallocate space on disc for output file

       -q, --quiet
	      suppress all messages

       -r, --retry-passes=<n>
	      exit after <n> retry passes (-1=infinity) [0]

       -R, --reverse
	      reverse direction of some copy operations

       -s, --size=<bytes>
	      maximum size of input data to be copied

       -S, --sparse
	      use sparse writes for output file

       -t, --truncate
	      truncate output file to zero size

       -T, --timeout=<interval>
	      maximum time since last successful read

       -v, --verbose
	      be verbose (a 2nd -v gives more)

       -w, --ignore-write-errors
	      make fill mode ignore write errors

       -x, --extend-outfile=<bytes>
	      extend outfile size to be at least this long

       -1, --log-rates=<file>
	      log rates and error sizes in file

       -2, --log-reads=<file>
	      log all read operations in file

       Numbers may be in decimal, hexadecimal or octal, and may be followed by
       a multiplier: s = sectors, k = 1000, Ki = 1024, M = 10^6,  Mi  =	 2^20,
       etc...  Time intervals have the format 1[.5][smhd] or 1/2[smhd].

       Exit  status:  0	 for a normal exit, 1 for environmental problems (file
       not found, invalid flags, I/O errors, etc), 2 to indicate a corrupt  or
       invalid input file, 3 for an internal consistency error (eg, bug) which
       caused ddrescue to panic.

REPORTING BUGS
       Report bugs to bug-ddrescue@gnu.org
       Ddrescue home page: http://www.gnu.org/software/ddrescue/ddrescue.html
       General help using GNU software: http://www.gnu.org/gethelp

COPYRIGHT
       Copyright © 2014 Antonio Diaz Diaz.  License GPLv3+: GNU GPL version  3
       or later <http://gnu.org/licenses/gpl.html>
       This  is	 free  software:  you  are free to change and redistribute it.
       There is NO WARRANTY, to the extent permitted by law.

SEE ALSO
       The full documentation for ddrescue is maintained as a Texinfo  manual.
       If  the info and ddrescue programs are properly installed at your site,
       the command

	      info ddrescue

       should give you access to the complete manual.

ddrescue 1.18.1			   June 2014			   DDRESCUE(1)
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