Part II dd copy destroyed DVD

[Schwibinger Michael <hbss@hotmail.com>]

Good afternoon

I m sorry again.

dd does not work.

I put in a "good" DVD.

dd if=/dev/dvd of=/path/to/dvdcopy.iso

is working and I can convert the ISO

But I put in the damaged DVD

dd cannot start.

How about:

dvdread

ddrescue

debiandvdbackup

acidrip

isobuster and wine.

Second:How can I use dd and others with an external dvddrive?

Regards

Sophie