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

[Antonio Diaz Diaz]

Hello Cezary,

Cezary Sliwa wrote:
> 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...

Thanks for reporting this.

Is this the message ddrescue shows?:
  "Bad logfile; last block begins past end of input file."


> 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.

Ddrescue already allows this, but only when the rest of the logfile is 
marked as non-tried. Maybe this requirement can be loosened to "there 
are no blocks marked as done in the rest of the logfile".


Regards,
Antonio.