Just did this update using:
Lycom ST-173-7 mSATA SSD to 2.5" IDE SSD Drive Converter
Kingston UV500 120GB mSATA SSD/Solid State Drive
Certainly starts up faster, although it still takes much the same time for the nav system to start, presumably down to the time it takes to acquire a GPS lock. Zooming in and out on the maps is faster as is entering destinations and looking up points of interest. All in all very worthwhile for £50.
I used a
StarTech.com USB 2.0 to SATA IDE Adapter USB2SATAIDE to read/write the disk.
Steve