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Date: Fri, 21 Aug 2009 17:22:54 +0200
From: Ulrich =?utf-8?B?U3DDtnJsZWlu?= <uqs@spoerlein.net>
To: Drew Tomlinson <drew@mykitchentable.net>
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Cc: freebsd-current@freebsd.org, Stefan Bethke <stb@lassitu.de>
Subject: Re: How To Copy DVD to ISO File
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On Wed, 19.08.2009 at 13:13:41 -0700, Drew Tomlinson wrote:
> Stefan Bethke wrote:
> > Am 19.08.2009 um 21:37 schrieb Drew Tomlinson:
> >> dd: /dev/acd0: Invalid argument
> >> 0+0 records in
> >> 0+0 records out
> >> 0 bytes transferred in 0.000132 secs (0 bytes/sec)
> >>
> >> I googled some more and thought that loading atapicam.ko might help.  
> >> But yet I get the same error when using /dev/cd0.
> >>
> >> So what am I doing wrong?
> >
> > The driver only supports reads of blocksized chunks, so:
> > $ dd if=/dec/acd0 bs=2048 ...
> > should work.
> 
> Thanks!  That was it.  I'm usually getting snagged by some sort of 
> "BS"...  :)

recoverdisk(1) should be faster, use it like this:

# touch image.iso
# recoverdisk /dev/acd0 image.iso

Regards,
Uli