-h, --help

display this help and exit

-V, --version

output version information and exit

-b, --block-size=<bytes>

hardware block size of input device [512]

-B, --binary-prefixes

show binary multipliers in numbers [default SI]

-c, --cluster-size=<blocks>

hardware blocks to copy at a time [128]

-C, --complete-only

do not read new data beyond logfile limits

-e, --max-errors=<n>

maximum number of error areas allowed

-i, --input-position=<pos>

starting position in input file [0]

-n, --no-split

do not try to split error areas

-o, --output-position=<pos>

starting position in output file [ipos]

-q, --quiet

quiet operation

-r, --max-retries=<n>

exit after given retries (-1=infinity) [0]

-s, --max-size=<bytes>

maximum size of data to be copied

-t, --truncate

truncate output file

-v, --verbose

verbose operation

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...

info ddrescue

should give you access to the complete manual.