Hi guys, you've been really helpful with my previous queries so hopefully i can get lucky some more
I've been running vista for a few months now, loving the superfetching and decided to have a look into readyboost, most people hated it but i liked the theory of it so wanted to see how it worked in practice so i got myself a 4Gb pen drive, banged it in and setup readyboost on the ammount windows recommended 3.76Gb or thereabouts.
Now it works and it speeds up things quite nicely so that is great but one of the points of it (i thought) is that because its flash memory the cache can stay there indefinitely ie it should stay there even after a reboot. But everytime i start my computer readyboost has to keep filling itself up.
Now obvioulsy onces its full the computer behaves as normal with the readyboost it is just annoying having all the hard driev access then when i don't think it is necessary.
I check the readyboost bytes cached using windows performance meter adding in the counter for bytes cached and when i start the computer up it starts from zero and fills to 4 gb's everytime.
Just wondering if this is indeed normal and whether other people find the same behaviour with their readyboost?
Cheers,
Anthony Smith

This is definitely the normal behavior of readyboost. When you shut down, Readyboost clears the cache on the flash drive, as a security precaution, according to a post I saw on Microsoft's TechNet from a Microsoft person.
This is normal behavior, which they are not planning on changing.