root@sysresccd /root % ddrescue --help
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.
Usage: ddrescue [options] infile outfile [logfile]
You should use a logfile unless you know what you are doing.
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
-b, --block-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 growth per second of error size
-f, --force overwrite output device or partition
-F, --fill=<types> fill given type blocks with infile data (?*/-+)
-g, --generate-logfile 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
-m, --domain-logfile=<file> restrict domain to finished blocks in file
[B] -M, --retrim mark all failed blocks as non-trimmed[/B]
-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, --max-retries=<n> exit after given retries (-1=infinity) [0]
-R, --reverse reverse direction of copy operations
-s, --max-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, --try-again mark non-split, non-trimmed blocks as non-tried
-v, --verbose verbose operation
-x, --extend-outfile=<bytes> extend outfile size to be at least this long
Numbers may be followed by a multiplier: b = blocks, k = kB = 10^3 = 1000,
Ki = KiB = 2^10 = 1024, M = 10^6, Mi = 2^20, G = 10^9, Gi = 2^30, etc...
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
root@sysresccd /root %
