On Dec 13, 2017, at 5:15 PM, J Martin Rushton <martinrushton56 at 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.