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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