Each time a new generation of media storage comes out it takes a while for the technology to mature. In the case of Blu-Ray DVD burners, until now 2x write speeds have been the norm. At that rate it takes as much as 45 minutes to burn 25 gigabytes of data to a standard Blu-Ray recordable disc. Now a few manufacturers have come out with 4x burners, effectively halving the amount of time it takes to burn a full BD-R disc. LaCie is one of the most recent, with their new "d2" drive burns both 25 gig and 50 gig Blu-Ray Recordable discs and comes with ports for both Firewire and USB connections. Of course, that degree of speed and convenience will cost a pretty penny. Street price at the moment is in the neighborhood of $649.00.
Source: Lacie.com