gddrescue 1.2-1.3 (amd64 binary) in ubuntu intrepid

 it copies data from one file or block device (hard disc, cdrom, etc)
 to another, trying hard to rescue data in case of read errors.
 .
 gddrescue does not truncate the output file if not asked to.
 So, every time you run it on the same output file,
 it tries to fill in the gaps.
 .
 The basic operation of ddrescue is fully automatic.
 That is, you don't have to wait for an error, stop the program,
 read the log, run it in reverse mode, etc.
 If you use the logfile feature of ddrescue, the data is rescued
 very efficiently (only the needed blocks are read).
 Also you can interrupt the rescue at any time and resume it later
 at the same point.
 .
 Automatic merging of backups: If you have two or more damaged
 copies of a file, cdrom, etc, and run ddrescue on all of them,
 one at a time, with the same output file, you will probably obtain
 a complete and error-free file. This is so because the probability
 of having damaged areas at the same places on different input files
 is very low. Using the logfile, only the needed blocks are read from
 the second and successive copies.
 .
 The logfile is periodically saved to disc. So in case of a crash you
 can resume the rescue with little recopying. Also, the same logfile
 can be used for multiple commands that copy different areas of the
 file, and for multiple recovery attempts over different subsets.
 .
 gddrescue aligns its I/O buffer to the sector size so that it can be
 used to read from raw devices. For efficiency reasons, also aligns it
 to the memory page size if page size is a multiple of sector size.