Re: [Bug-ddrescue] ddrescue --reverse

[Antonio Diaz Diaz]

Hello Ole,

Ole Tange wrote:
> I am looking a the man page and info page of --reverse.
>
> I have been unable to find an example using --reverse and the
> description is not so clear that I dare try it on important data.

Thanks for pointing this out.


> If I am correct, then the man page can be changed to:
>
> `-R'
> `--reverse'
>      Reads sectors in backwards order. This is useful if the disk goes
> offline when reading a failing sector. By starting after the failing
> sector and going --reverse you work your way down to the failing
> sector. --reverse does _not_ reverse which file is input and output.

More or less, but --reverse is a little more complicated than that; it 
reverses the direction of all copy operations. The passes which are 
normally run forwards (copying, splitting and retrying) are run 
backwards, while the pass which is normally run backwards (trimming) is 
run forwards.

I'll clarify the description and include an example.


Best regards,
Antonio.