Neither is correct, but assuming there's no DVD-ROM abilities in the drive, the person who says it won't work was closer to correct.
DVDs are coated with a different material on the recorded side which allows for the higher density of data. The laser is the same, it's just the CD drive doesn't know how to read this.
That being said, you'll still need a DVD decoder of some sort to make use of the raw data.
Will DVD movies run on a Samsung CD- R/RW SW-252F drive?
I have been told different things i.e that it will run if I buy a DVD decoder program but I have also been told that the laser used in a CD data drive is not the same as that used to read DVD disks.
What is the correct answer?