Re: [bug-ddrescue] Only going backwards

[Barry Allsop]

Just been using it with the —size function and thanks it a good idea and a lot 
more control.


The process was running in background and regenerating a mapfile so every time 
I deleted it would return.

But sudo killall ddrescue killed the background process.

—size will remove any chance of it happening again and a good option to learn.

Thanks 
Barry 

> On 26 Jul 2023, at 19:08, Antonio Diaz Diaz <antonio@gnu.org> wrote:
> 
> Hello Barry,
> 
> Barry Allsop wrote:
>> Firstly ddrescue is excellent so thank you.
> 
> You are welcome. :-)
> 
>> I have it on all my computers lastly iMac now the issue I'm having is the
>> unrecognised disk size.
> 
> Ddrescue can't detect the size of a raw /dev/rdiskN device. See 
> http://www.gnu.org/software/ddrescue/manual/ddrescue_manual.html#Direct-disc-access
> 
> "On some systems, ddrescue can't determine the size of a raw device, so an 
> explicit --size or --complete-only option may be needed."
> 
>> It reads 9223 PB now this was not issue first time tried but experimenting I
>> selected -R per[s foolishly in hindsight not its stuck in reverse mode.
>> 
>> When ever I use mapfile its auto starts in reverse (regard less of selected
>> disks) I presume at some Imaginary 9223 PB location and nothing happens.
>> 
>> I tried wiping all mapflies I can find but still it starts in backwards mode 
>> as
>> soon as it starts cloning with mapfile, if I leave mapfile off the command it
>> works.
>> 
>> I presume their is a hidden log somewhere
> 
> It is not hidden. From your command line I can see that it is named mapfile, 
> and it is in the directory from which you are running ddrescue. Just delete 
> it, or run ddrescue with a small --size and then with the right --size to 
> reset it to forward mode.
> 
> Hope this helps,
> Antonio.