I hope it is a laptop drive. I have not had much luck with cd drives for this project. A CD exploded in one drive.(see my off topic post)
The second drive has developed a very bad clicking noise when it spins up. I had it loose and pluged in to the mobo to install Windows ect.. My Dad wandered in, saw the drive. Picked it up!. Tipped it sideways, and the gyroscopic effect of the spinning disk ripped the drive out of his hand. and caused the disk to unseat itself and become unreadable.
So pick a drive that will be tolerant to external forces. Laptop drives need the CD to be firmly 'clicked' in place. I have no experience with laptop DVD/CD drive, but IMHO this is probably the best way to go.
I would love to know how Headunits go about disk location.
I have never seen inside one, CD autochangers have a rubber mounted cradle to support the disk and lense.
Let me know how it goes, I think DVD may me an optin for my next iteration.