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ddrescue - data recovery tool


ddrescue [options] infile outfile [logfile]


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.


-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-trimmed, non-scraped 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 of domain 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, --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-scrape
skip the scraping 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

-P, --data-preview[=<lines>]
show some lines of the latest data read [3]

-q, --quiet
suppress all messages

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

-R, --reverse
reverse the direction of all passes

-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

-u, --unidirectional
run all passes in the same direction

-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

-X, --exit-on-error
exit after the first read error

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

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

--ask ask for confirmation before starting the copy

select what copying pass(es) to run

time to wait between passes [0]

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.


Report bugs to [email protected]
Ddrescue home page: http://www.gnu.org/software/ddrescue/ddrescue.html
General help using GNU software: http://www.gnu.org/gethelp


Copyright © 2014 Antonio Diaz Diaz. License GPLv2+: GNU GPL version 2 or later
This is free software: you are free to change and redistribute it. There is NO WARRANTY,
to the extent permitted by law.

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