DVD cloning tool

David Kelly dkelly at hiwaay.net
Fri Dec 5 11:32:23 PST 2008

On Fri, Dec 05, 2008 at 05:18:01PM +0100, Wojciech Puchar wrote:
> >
> >Thanks, dd is a good suggestion for ISO data. But what I need
> once again please do
> man dd
> dd reads sector by sector.
> it won't work only for audio-sectors on CD , on DVD movies are stored 
> using "normal" 2K sectors

Agree that dd is good for simple CDs and DVDs but can't say that I know
it will behave on multi-session or multi-format discs.

In years past there was an issue where some drives would return EOF with
the last sector and others would wait until attempt to read past the
last sector yet would return data. So with multiple generations of copy
each generation got one block longer. Know this because 10 years ago
working in a data warehouse I easily won the argument against using
Windows to duplicate/distribute data on CD for lack of a disc verify
utility. These days the Disk Utility in MacOS X automatically verifies.
But back then under FreeBSD I used dd and handled EOF specially in my
shell script.

David Kelly N4HHE, dkelly at HiWAAY.net
Whom computers would destroy, they must first drive mad.

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