My DVD unit can read a data DVD but not an (original) video DVD

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http://www.linuxquestions.org – Hello everybody, I was trying to watch a movie from an original DVD that I have bought recently, but I was unable to. When I put the DVD on my unit and try to mount it (mount /dev/cdrom /mnt/cdrom) I get this error: mount: /dev/sr0: unknown device I found the same error using /dev/cdrom, /dev/sr0 or /dev/dvd on the mounting command. I try with several original movie DVDs (region 1 and region 2) but I didn't get to mount any of them. However, on the same PC but in my Windows session I can watch the movie without problem. I also can watch the movie on a normal DVD player. After trying (HowTos)