Replacing a failing HD

Ramakrishna Nalla nallark at gmail.com
Tue Oct 18 21:52:01 PDT 2005


But, won't doing a dd between two disks with incompatible sizes create a bad
partition table on the destination drive?

TIA,
Rama

On 10/19/05, Bob Ababurko <ababurko at adelphia.net> wrote:
>
> Craig Deal wrote:
> >
> >
> >>>Hope it's ok to continue this thread, but can you explain in more
> >>>detail how to use dd to copy a HD. I read "man dd" and was
> >>
> >>unable to
> >>
> >>>figure out how this is done.
> >>>
> >>>Thanks,
> >>>Craig
> >>>
> >>>_______________________________________________
> >>>freebsd-questions at freebsd.org mailing list
> >>>http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> >>>To unsubscribe, send any mail to
> >>
> >>"freebsd-questions-unsubscribe at freebsd.org"
> >>
> >>This is what I have done in the past.
> >>
> >>dd if=/dev/da0 of=/dev/da1 bs=8192b
> >>
> >>where da0 is the disk you want to copy and da1 is the new,
> >>blank disk.
> >>I should also mention that it is wise to do this in single
> >>user mode. I actually have read this somewhere and
> >>understand the point of it, but I must also say that I have
> >>done it both ways and they have both worked.
> >>YMMV I would have to say it is all dependant and what you
> >>have running.
> >>
> >>I have done this too many times to count and it is very easy.
> >>
> >>peace,
> >>Bob
> >>_______________________________________________
> >>freebsd-questions at freebsd.org mailing list
> >>http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> >>To unsubscribe, send any mail to
> >>"freebsd-questions-unsubscribe at freebsd.org"
> >>
> >
> >
> > I tried this and got the following error:
> >
> > ad0: FAILURE - READ_DMA status=51<READY,DSC,ERROR>
> error=40<UNCORRECTABLE>
> > LBA=8387712
> >
> > Any ideas what the problem might be? Do the hard drives have to be
> > identical? One is a 30Gb and the other is a 60GB.
> >
> > Thanks,
> > Craig
> >
> > _______________________________________________
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> freebsd-questions-unsubscribe at freebsd.org"
> >
>
> I would think that you can dd from a small drive to a large drive, but
> if the is possible _definitely_ not the other way around. Which size
> are source and dest. drive?
>
> -Bob
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