As far as I'm aware Antonio is looking into the skip ahead size option, there has been a few back & forward mails about such a feature in the last two weaks so maybe read the other topics in this mailing list.
I asked about a reverse read a long time ago but I cannot remember the replies. Cheers On 5 October 2011 22:02, Roberto Gini <[email protected]> wrote: > Dear Antonio, this is Roberto from Verona, Italia une ddrescue user > > thank you so much for your work with ddrescue. > > I'd like to suggest an additional example in this section > http://www.gnu.org/software/ddrescue/manual/ddrescue_manual.html#Examples > > if you read over the internet, ddrescue is, together with forensic, mostly > suggested for very bad drives (lot of bad sectors and drives becoming > unstable) > > why don't you add a specific example and sequence for the case "cloning a > drive with a lot of bad sectors" ? > > Additionally, I'd like to ask you why don't to implement a user definable > *skip ahead size amount* *and read backward* , in case of bad sectors > encountering. I've read the algorithm, but this is a little different and > would give the user a better feeling of what is going on with the drive. > As example, starting to clone a 500GB bad drive, I notice that after 20GB > of nice cloning, they rises a lot of errors. In my idea I would stop the > cloning and choose to add a --skip-ahead-icoe=1M (icoe=in case of error). > The goal is to understand if one megabyte forward, the situation is better. > If the situation is better, I would expect ddrescue to start reading > backward this 1MB portion until the first error happen, at this point, > ddrescue will return to the initial skip ahead point to continue the disk > cloning in forward direction. > To end up and finish with my request (any explanation about this request to > be a non sense will be appreciated and welcome) I would say that if 1MB > falls again in bad areas, I would skip 5MB or 10MB or 50MB. > > Thank you for any answer, about the example request and also regarding the > feature. > > Roberto > > P.S. there are some drives that are recognized nice by the BIOS, they do > not make bad noises but as soon linux or windows starts effectively to boot, > such drives (either if connected on secondary channels) hangs the windows > boot. It would be nice to have a ddrescue like tool interfacing directly > with the ATA interface. Do you know something similar out there? Have you > ever thought about this? > > _______________________________________________ > Bug-ddrescue mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/bug-ddrescue > > -- Kind Regards Reon Toerien __________________ PO Box 540 Ballito 4420 South Africa Tel: +27 (0) 83 270 2889 email: [email protected]
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