Replacing a failing HD
Bob Ababurko
ababurko at adelphia.net
Tue Oct 18 15:27:08 PDT 2005
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
>>>
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>>
>>"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
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>
>
> 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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>
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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