Provided by: gddrescue_1.17-1_amd64 
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 hard to rescue data 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
-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=<bytes>
initial size to skip on read error [64 KiB]
-l, --logfile-size=<entries>
do not grow logfile beyond this size [1000]
-m, --domain-logfile=<file>
restrict domain to finished blocks in file
-M, --retrim
mark all failed blocks as non-trimmed
-n, --no-split
do not try to split or retry failed blocks
-o, --output-position=<bytes>
starting position in output file [ipos]
-p, --preallocate
preallocate space on disc for output file
-q, --quiet
suppress all messages
-r, --retries=<n>
exit after given retries (-1=infinity) [0]
-R, --reverse
reverse direction of 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
Numbers may be followed by a multiplier: s = sectors, k = kB = 10^3 = 1000, Ki = KiB =
2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, 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 © 2013 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.