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8x is the speed that the drive will right and Dual-Layer means that it can encrypt data onto 2 layers on the disk meaning it can hold twice as much data in the same space
 
8x is the speed that the drive will right and Dual-Layer means that it can encrypt data onto 2 layers on the disk meaning it can hold twice as much data in the same space

So my MBP's 8x superdrive can't write onto dual layers, as opposed to the Penryn MBP which can write dual layers?
 
What are the specs of your MBP? My 18 month old 2.16 Core Duo will burn dual layer dvd's, so I imagine yours will as well.
 
They are the same thing. 8x and dual layer are not mutually exclusive. *x is the speed and dual layer specifies that it can handle dual layer discs. An 8x Superdrive can burn DVDs at 8x AND burn dual layer DVDs as well.
 
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