[Bug-ddrescue] an issue with reading cd-rom discs on linux

[Cezary Sliwa]

Not actually a bug, but it might be desirable to address this.

A CD-R disc written in Track-At-Once mode has two unreadable run-out
blocks at the end of the track. Linux seems to shrink the reported
length of the track when reading the last sectors of a track fails. If
this happens, ddrescue cannot be restarted (it reports that the input
file is shorter than the log data). Actually, one may reinsert the
disc before a restart, but imagine the disc is hardly recognizable...

It might be a good idea to allow rescuing data from a file which is
shorter than the log, even independently of the above issue.

Best wishes,
Cezary Sliwa