Wouldn't you have to wont the fs in order to dd it?  And if mounting the 
fs is the issue I fail to see how this suggestion helps.

Or I could be talking out of my a??.

David Mandala wrote:
> I wonder why you don't simply use dd to dd the image of the drive to an
> image file and then work from the image? Then you will never change the
> master drive? That will get even the erased space not just the active
> file area and allow you to work with it with no possibility of changing
> the original.
> 
> Davidm
> 
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