I was curious about this, since my new MacBook makes slightly different loading/ejecting sounds than my old MacBook.
Model: MATSHITADVD-R UJ-868
Revision: KA14
Firmware Revision: KA14
Interconnect: ATAPI
Burn Support: Yes (Apple Shipping Drive)
Cache: 2048 KB
Reads DVD: Yes
CD-Write: -R, -RW
DVD-Write: -R, -R DL, -RW, +R, +R DL, +RW
Write Strategies: CD-TAO, CD-SAO, DVD-DAO