I do remember that it's explained somewhere. 80GB is the total capacity of the drive with most of it reserved for the navigation system, system software, miscellaneous storage (profiles, etc) and 12GB reserved for you to store music on.
@Copasetic222: If you were able to store over 100 CDs on the drive already, I guess the car does apply compression (wasn't sure if it did or not). I doubt you have control over the compression settings though...
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2009 750i individual | Citrin Black Metallic | Platinum Merino Extended Leather | BMW Individual Composition Package (includes Sport Package) | Dynamic Handling Package | Multimedia Package | Technology Package | Executive Package
http://www.7post.com/forums/showthread.php?t=234432
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