i'm not sure...I had that in my head...but often those things won't fit in a laptop optical right? Though, they may have them for laptops...get something to blow air in there.
but also, are these discs you are reading standard? they don't have some kind of adhesive paper layer on them do they? like a decal of sorts?
Reminds me of my wedding dvd, it makes this funky paper shuffling noise in my asus laptop...slot load optical. "Normal" discs without this extra fatness don't do it
edit: just came across this for ya mate!
How To Clean A Laptop (Technology: Hardware SOS)