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http://www.microsoft.com/windowsvista/features/foreveryone/performance.mspx
you need superfetch activated and your OS must recognize your memory stick
Windows Vista is designed to help make you more productive as you work with your PC throughout the day with new features like Sleep, Windows SuperFetch, Windows ReadyBoost, and Windows ReadyDrive.
Windows SuperFetch helps manage memory to get the most out of available RAM while Windows ReadyBoost helps make PCs more responsive by using flash memory devices (like USB thumb drives) to boost performance. Windows ReadyDrive takes advantage of new hybrid hard disks—hard disks with integrated flash memory—to help improve battery life, performance, and reliability. With Windows Vista, your system is ready when you are.