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From: "Gayn Winters" <gayn.winters@bristolsystems.com>
To: "'Craig Deal'" <craig@advantagecomputer.biz>,
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Date: Tue, 18 Oct 2005 18:53:08 -0700
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Subject: RE: Replacing a failing HD
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> > 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@freebsd.org mailing list 
> > >>>http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> > >>>To unsubscribe, send any mail to
> > >>
> > >>"freebsd-questions-unsubscribe@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
> > >>
> > > 
> > > 
> > > I tried this and got the following error:
> > > 
> > > ad0: FAILURE - READ_DMA status=51<READY,DSC,ERROR> 
> > > error=40<UNCORRECTABLE>
> > > LBA=8387712

A couple ideas for dd:

Have you tried bs=512b ?

How about conv=noerror ?


-gayn