"Like dd, dd_rescue does copy data from one file or block device
to another.dd_rescue is a tool to help you to save data from
crashed partition. It tries to read and if it fails, it will go on
with the next sectors where tools like dd will fail. If the copying
process is interrupted by the user it is possible to continue at
any position later. It can copy backwards.
"Imagine, one of your partitions is crashed, and as there are
some hard errors, you don't want to write to this hard disk any
more. Just getting all the data off it and retiring it seems to be
suitable. However, you can't access the files, as the file system
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