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Man Pages


Manual Reference Pages  -  DDRESCUE (1)

NAME

ddrescue - data recovery tool

CONTENTS

Synopsis
Description
Options
Copyright

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.
Search for    or go to Top of page |  Section 1 |  Main Index


ddrescue 1.18.1 DDRESCUE (1) June 2014

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