I have gotten the above error message -- "A device attached to the system is not working" -- in trying to back up a number of movies with DVDShrink 3.2, DVD Rebuilder 0.70, CloneDVD2, and Nero Recode2.
My most recent attempt was Citizen Kane.
In DVDShrink and Nero Recode2, the failure occurred near the end of the analysis.
In Rebuilder, the failure occurred during Phase II (Encoding)
CloneDVD2's "details" suggested that the target drive for temporary files might not have sufficient space, but it does.
Any help would be appreciated.
If any additional information is needed, please ask.