package ddrescue

ddrescue - copies 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 even copy backwards.

For examples on using ddrescue read this article at Debian Admin

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