On Dec 13, 2017, at 5:15 PM, J Martin Rushton <martinrushto...@btinternet.com> 
wrote:
> 
> # dd if=/dev/sdc of=/home/dd-copy-of-sdc

Better, use ddrescue:

   https://www.gnu.org/software/ddrescue/

dd will do unfortunate things like quit early on I/O errors, even if later 
blocks would read just fine.  ddrescue assumes the input file is dodgy and 
tries to cope.
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