This is what a hard drive in your computer looks like, more or less (different brands look a bit different). Inside the unit are platters which spin, and there are little arms with "heads" that read the data. If you think of the old time record player with the arm and the needle on the record, the needle is like the head which reads the data on the disk. It's a rectangular box about five inches long, three and a half inches wide, and anywhere from a half an inch to an inch or so in thickness.
Your LightScribe is a totally separate unit inside the computer case.
Optical drives use a laser to read and write the information to the discs.
Some people make the mistake of calling the whole computer case, "the hard drive," and then they get others to doing it. It's understandable, but not accurate.
