Superdrive
The name comes from the original floppy drive upgrade in the Mac IIcx. It was a 1.44mb vs. the old 800k drives. Apple has since used that name to signify a higher capacity, higher performing removable drive. Apple now uses it to signify a DVD burner vs. the usual combo drive DVD read, CD/CDR read/write. It is just a name that Apple has preserved since 1989. I would know since I purchased the very first Apple machine with a superdrive (a mac IIcx in 1989 at college). Any burner that is compatible with itunes is essentially a superdrive, just purchase a $30 one as noted above and be happy. Apple drives usually have a firmware change that indicates it is Apple OEM. Not such a big deal anymore.
Noushy