It has an extra button for changing tracks and fast-forwarding through music CD selections.
CNN: IDG.net - Recordable and rewritable CD drives: Permanent, portable storage
That chip supply is improving gives Apple fans the chance to have the fastest chip without the extra options--apparently, there are more of the fast chips than there are Superdrives.
FORBES: Ten O'Clock Tech: Apple Offers Lower-Priced G4
The optional, extra-cost, 4G LTE cellular-data capability made it feel like I was always on a fast Wi-Fi connection.
WSJ: The New iPad Review: Faster, Sharper and Thicker | Walt Mossberg
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