ddrescue

copy data from one file or block device to another
dd_rescue is a tool to help you to save data from crashed
partition. Like dd, dd_rescue does copy data from one file or
block device to another. But dd_rescue does not abort on errors
on the input file (unless you specify a maximum error number).
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.
If the copying process is interrupted by the user it is possible
to continue at any position later. It also does not truncate
the output file (unless asked to). It allows you to start from
the end of a file and move backwards as well. dd_rescue does
not provide character conversions.
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Please note that this is the dd_rescue version of Kurt Garloff
providing the /bin/dd_rescue executable. If you are searching
for the GNU ddrescue version please check out the gddrescue
package instead.