Readyboost deletes cache on reboot

[JW]

Since Ready Boost also supports Ready Boot by recording activity during the
first 90 seconds after boot so that SuperFetch can do a better job. It may
be that the cache gets deleted on any system on which you have the
SuperFetch service enabled.

The following link has some paragraphs that may answer your question:

http://technet.microsoft.com/en-us/magazine/cc162480.aspx

 

[eyesy79]

Same problem here. Using a 2Gb DataTraveller USB stick, specifically ReadyBoost compatible. I see in the event log that the cache gets deleted on shutdown.

The cache seems to get rebuilt about 30 seconds after logging in - at first nothing happens, and the hard disk is silent. Then it starts thrashing, and looking in Performance and Reliability monitor I can see sfcache getting lots of writes. It takes a good few minutes of thrashing to fill up the 2GB cache file - there must be a way to stop this happening!