Macbook says that my dvd is a blank disk?

I have a dvd- I bought it from HMV, it's not a pirate copy- and when I put it into my macbook it made strange noises and kept saying 'skipping over damaged area.' I clicked 'menu' on the dvd control pad and it came up with an error message. It wouldn't eject, so I used disk utility to eject it. Disk utility said that I had entered a blank disk- but initially when I put the disk in the computer DVD player opened automatically. Does anybody know what's wrong?