ddrescue Recovery Notes
Notes on the command ddrescue. In my case mostly for recovering a drive to a healthy one but can also be used with files. You can use SystemRescueCD to boot & run.
ddrescue command example
ddrescue -r3 -n -N -v /dev/sda /dev/sdb logfile.log -f ^ -rN, --retry-passes N -n, --no-scrape (scraping and trimming may take extreme amounts of time (months)). -N, --no-trim -v, --verbose -f, --force (ignored for regular files, confirms that you want to overwrite dest disk/part) gnu.org reference