Re: ddrescue - disk 2 disk (ntfs)

[Antonio Diaz Diaz]

Hello Radomír,

Radomír Tomis wrote:
> > > When I try "sudo ddrescue -v /dev/sdb/ /dev/sdc logfile"
> > >
> > > I get "no space left on device"
> > >
> > > I asusme its something to do with the new disk, maybe having to copy/mount
> > > in raw? please help.
> >
> > Maybe the error is not about writing to sdc but about writing the logfile.
>
> There would be no "Maybe the error is ..." in case ddrescue would provide
> the source of the error (i.e. complete error diagnostics):
>
>     ddrescue: /dev/sdc: Write error: No space left on device
>     ddrescue: logfile: Write error: No space left on device
>
> instead of just:
>
>     ddrescue: Write error: No space left on device
>
> This is not the case even in the latest version 1.25 (11 years thereafter).
> It took me a while to figure out the real source of the problem.

Ddrescue 1.25 reports different diagnostics for outfile and mapfile:

ddrescue: Write error: No space left on device
Error writing mapfile 'mapfile': No space left on device

Moreover, an error writing to the mapfile is treated very differently from 
an error writing to outfile:

http://www.gnu.org/software/ddrescue/manual/ddrescue_manual.html#Emergency-save


> The error diagnostics is insufficient in lot of software, but I'd expect
> ddrescue better than that.

I do not remember anybody reporting this problem clearly enough before. I 
have in the TODO list for ddrescue "replace show_error with show_file_error 
where adequate", but until now I didn't consider it a priority because it 
seemed clear to me that a write error causing an immediate exit implied 
outfile. Maybe I were wrong.


> Anyway, thank you Antonio for such a great tool !

You are welcome.

The "Write error" diagnostic will show the name of outfile in the next 
version of ddrescue. Hope this is what you wanted.


Best regards,
Antonio.