Ambiguity and differences across jurisdictions exists with respect to the legalities around viewing purchased DVDs and movies. Copying of DVDs as a form of backup in case of loss or damage to the DVD may be appropriate.
Some packages expect the DVD device to be called
/dev/dvd/. If it does not exist, and your DVD device is
/dev/hdc/, for example, then simply:
# ln -s /dev/hdc /dev/dvd
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