dd command is commonly used to make image backups of a drive or partition. However, it performs poorly if the source drive is unreliable or failing. I read that
dd_rescue is a good tool to use to recover an image from a bad drive, since it intelligently attempts to re-read sectors that it failed to read the first time.
But in the Ubuntu repositories, I see two different
ddrescue programs, with 3 different but similar names showing up in different places:
dd_rescue. What's the difference?