However, `dd` can fail on some disks, perhaps due to damage or copy protection.
[This post on unix.stackexchange describes a trick that works](https://unix.stackexchange.com/a/642790):
-* Start playback of the disc using [VLC media player](https://www.videolan.org/vlc/)
-* Run a command like `ddrescue -n -b2048 -K1M /dev/sr0 x.iso x.map`
+* Start playback of the disc using [VLC media player](https://www.videolan.org/vlc/).
+* Try `dd` first, if it fails, then run a command like `ddrescue -n -b2048 -K1M /dev/sr0 x.iso x.map`.
* After `ddrescue` starts running, pause playback.
[FindVUK](http://fvonline-db.bplaced.net/) has the keys to rip Blu-ray discs.