Some surprise while "dd-ing" a video DVD...

[Andrea Giuliano]

dan wrote:
> On 18/01/06, Andrea Giuliano <a.giuliano at iccu.sbn.it> wrote:
> 
>>Hi!
>>I know that a video DVD has an ISO9660 filesystem, just like any data
>>DVD or CD (if I'm not wrong). So I thought I could create an ISO image
>>of a video DVD using "dd" or "readcd", for instance.
> 
> 
> According to http://www.burnworld.com/dvd/primer/filesystem.htm :
> 
> "DVD-Video discs use only UDF with all required data specified by UDF
> and ISO 13346 to allow playing in computer systems. They do not use
> ISO 9660 at all."

So I was completely wrong: video DVDs use UDF, not ISO9660. I will try 
to mount the image I dd-ed last night, and let you know (I have it at 
home, I'm not home at present).

> 
> Never had any problems myself with dd on DVD's, though i've only tried
> it with  Mac OS X disc. I use:
> 
> umount /dev/hdc
> dd if=/dev/cdrom of=cd.iso
> 

I guess you mean the disk used to install the operating system. I also 
guess it's not a video DVD, that's right? If so, I think I could do the 
same too. I tried to dd Debian DVD, Fedora DVD and a couple of other 
data DVDs I burned, and they all work perfectly.

Again, the problem only seems to arise with video DVD.

Best regards.

> Dan
> --
> http://www.danicity.co.uk
> 

-- 
Andrea Giuliano, Ph. D.
ICCU - Istituto Centrale per il Catalogo Unico
Viale Castro Pretorio 105, Rome - ITALY
Tel. +39 06 49210403, Fax +39 06 4959302