copying /dev/da0 with dd(1) to file: output differs

[Peter Pentchev]

On Fri, Nov 19, 2010 at 06:35:19PM +0100, Matthias Apitz wrote:
> El día Friday, November 19, 2010 a las 06:21:09PM +0100, Hans Petter Selasky escribió:
> 
> > > > Can you dump the data into hex using hexdump -C and show us the
> > > > difference.
> > > 
> > > Note: the output of the dd(1) is around 3.8 GByte. I compared the 1st
> > > 2.000.000 lines of the hexdump: no diff; any better tool to show the 1st
> > > block which differs?
> > > 
> > > > Usually you would use bs=65536 (Does that change anything)?
> > > 
> > > Same result: they differ :-(
> > > 
> > > 	matthias
> > 
> > bsdiff ?
> 
> This will not work with such big files (requires 8x memory of the file):
> 
> I was thinking in a tool just reading each file block by block,
> comparing the blocks and noting the 1st diff with block offset number.
> (some 10 lines of C code :-))

Errrr... are you thinking of cmp(1), maybe with the -l option? :)

G'luck,
Peter

-- 
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