I can tell you that the Sony 2gig memory stick pro duo does not work with speed boost. And the funny thing is I wanted a sandisk one and BB was out of them.
Sony should really work it is their computer.
I am confused. How come that the slower SanDisk 8GB Ultra ll Memory Stick PRO Duo (rated 10MB/sec Read/Write Speed) works with readyboost while the faster Sony MSXM8GS (rated minimum 15MB/sec Read/Write Speed) doesn't? is there something else besides speed that matters here?