MacBook Pro SATA Speed Issues
Tuesday, June 23, 2009 at 11:06AM 
Apple on Monday released an EFI firmware update for the MacBook Pro models launched earlier this month. The update brings back support for the 3Gbps SATA specification, although the company warns that it has not offered or qualified drives running at transfer rates higher than 1.5Gbps. Earlier reports indicated the new systems had switched from 3Gbps specifications down to a 1.5Gbps limit.
MacBook Pro EFI Firmware Update 1.7 addresses an issue reported by a small number of customers using drives based on the SATA 3Gbps specification with the June 2009 MacBook Pro. While this update allows drives to use transfer rates greater than 1.5Gbps, Apple has not qualified or offered these drives for Mac notebooks and their use is unsupported.
How very kind of Apple to admit to something they should never have done in the first place.
MacBook Pro EFI Firmware Update 1.7 - 3.35MB
Further details are available in the related support document.
apple, macbook pro in Firmware 
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