Like dd, dd_rescue does copy data from one file or block device
to another.
You can specify file positions (called seek and Skip in dd).
There are several differences:
- dd_rescue does not provide character conversions.
- The command syntax is different. Call dd_rescue -h.
- ddrescue does not abort on errors on the input file,
unless you specify a maximum error number. Then ddrescue
will abort when this number is reached.
- dd_rescue does not truncate the output file, unless asked to.
- You can tell dd_rescue to start from the end of a file and
move backwards.
- It uses two block sizes, a large (soft) block size and a small
(hard) block size. In case of errors, the size falls back to
the small one and is promoted again after a while without errors.
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openssl