Re: [bug-ddrescue] Resuming ddrescue with newer version?

[Antonio Diaz Diaz]

Hello Val.

val wrote:
> I would like to resume the data recovery I started using the latest
> version of ddrescue (i.e. use ddrescue 1.25 with a mapfile and already
> recovered data from ddrescue 1.17).

Since the status line was added to the mapfile (then logfile) in version 1.6 
(2007) old mapfiles are compatible with newer versions of ddrescue. The 
field 'current_pass' was added to the mapfile in version 1.22 (2017), but it 
is optional and its absence should not cause problems.

But to be sure, make a copy of the old mapfile before passing it to ddrescue 
1.25 so that you still can resume the rescue using the copy if something bad 
happens.


> Is this possible without corrupting the data that I already recovered?

Different versions of ddrescue may copy the data blocks in different order, 
but they should never corrupt the data (copying some block to the wrong place).


Best regards,
Antonio.