[Bug-ddrescue] Request for example of rescuing a dvd data disk

[Bob]

Hi

I am trying to recover a dvd data disk. It reports the following 
errors:- wrong fs type; bad option; bad super block; missing code page.

I have read the manual but can't find an example recovering a 4.7GB dvd. 
I have only one drive.

Could you please furnish an example to run gddrescue on a data dvd, 
saving to a file on the hard drive and then writing to a fresh dvd with 
only one drive available.

Ubuntu 11.10 AMD64

Thank you
Bob