El día Friday, November 19, 2010 a las 05:42:57PM -0700, Warren Block escribió:
> On Fri, 19 Nov 2010, Matthias Apitz wrote:
> > El d?a Friday, November 19, 2010 a las 12:39:13PM -0700, Warren Block
> > escribi?:
> >>> Should I overwrite the full USB key from /dev/zero?
> >> Possibly there would still be differences. Filesystem metadata like
> >> date last mounted, for example. If you want a block-by-block duplicate,
> >> the brute-force method is to just dd the whole drive. Use bs=64k or
> >> bs=1m to help reduce overhead.
> > Warren, perhaps you missed my point. I have a prepared boot-able key and
> > I want to give away a copy of it as a file on DVD. So I dd(1)'ed the key
> > to disk and did this twice to ensure that the copy was fine, but the two
> > files differ. How can I make sure that the file on disk (or DVD) is a
> > exact copy of the key?
> Okay, that makes more sense. Did you mount the key in between the two
> times it was dd-ed?
No. I just fired up the dd(1) a 2nd time to another file to check if it
would produce two times the same result. And, surprise, they differ,
they differ each time and in laptops differentes as well.
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