Re: [Bug-ddrescue] Can ddrescue use "ddrescue output" as input?

[Gábor KATONA]

Hi Jaime,

The answer is definitely yes, since ddrescue works on files.

I think the following should work:

Copy the good parts in each image using its own logfile as a domain logfile:

ddrescue -domain-logfile=logfileX isoDVDimageX recoveredDVD recoveredlog

So in your case 3 commands:

ddrescue -domain-logfile=logfile1 isoDVDimage1 recoveredDVD recoveredlog
ddrescue -domain-logfile=logfile2 isoDVDimage2 recoveredDVD recoveredlog
ddrescue -domain-logfile=logfile3 isoDVDimage3 recoveredDVD recoveredlog

After this look at recoveredlog. If it contains only one range with a + 
sign, you are done. If not, you need some further work on the non 
rescued parts, but it will be a second story.

Regards,

Gábor


2013-08-30 02:32 keltezéssel, Jaime T írta:
> Hi,
>
> I realise that this is a strange question, but can ddrescue use
> "ddrescue output" as input? I'll try to explain what I mean.
>
> I have 3 dvds which were identical "burns" of a single iso file.
> Unfortunately, all 3 dvds are now exhibiting read errors. I've read
> all 3 of the "broken" dvds with ddrescue, so I now have the following
> files:
>
> isoDvdImage1
> logfile1
> isoDvdImage2
> logfile2
> isoDvdImage3
> logfile3
>
> I'd like to use ddrescue again to see if I can "combine" these images
> into 1 image with no errors (i.e. if every byte from the original iso
> file is readable from at least one of the iso images). I am already
> aware that I might be able to just recreate the original iso file by
> swapping out my 3 disks, but given that I have these 3 disks as
> "ddrescue-format" images, can I re-use these images to re-constitute
> the original iso file?
>
> I guess that this is quite similar to what the ddrescue manual calls
> "Automatic merging of backups", but instead of now having "two or more
> damaged copies of a file, cdrom, etc", I have "two or more sets of
> output files from ddrescue".
>
> I hope that this makes sense! Thank you in advance for any advice or
> help you can offer.
>
> With kind regards, Jaime
>
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