Newer Superdrive?

[Benn]

-SuperDrive (DVD-R/CD-RW); writes DVD-R discs at 1x speed; reads DVDs 
at 6x speed; writes CD-R discs at 8x speed; writes CD-RW discs at 4x 
speed; reads CDs at 24x speed (15-inch models)

-SuperDrive (DVD-R/CD-RW); Writes DVD-R discs at 2x speed; reads DVDs  
at 6x speed; writes CD-R discs at 8x speed; writes CD-RW discs at 4x 
speed; reads CDs at 24x speed (17-inch model)

Please note that it says the 17" Superdrive writes DVD-R at 2X speed.  
Nice little bump there.  Though I wonder if apple made a mistake on 
their specs page...

Benn