|Internal/external. Their service life is related to the quality of the components that went into the manufacture, and the amount of use they get, together with the physical environment in which they are used. Dirt, dust, smoke etc can cause premature wear or gum up the lubricated moving parts|
I don't have a laptop, only desktop systems and since burners are more expensive than ROMs I usually run two optic drives. One kept for burning and another for installing software, music & dvd , Game disks etc.
If your laptop burner outlasts the system warranty then the manufacturer has achieved their aim & promise.It's called planned obsolescence. Nothing today is built to last. It is designed with a limited service life. I recall reading somewhere that the typical burner has an expected service life of about 1000 disks. At that point the laser is weakening and burn quality begins to deteriorate. That equates to about 1 a day for 3 years. Do you expect to still be using this laptop after 3 years? ( I would but that's just me. I'm still using a couple of old Piii systems to run tests and act as a printserver )
Goin' Fishin' (Some day)