If you are running Windows 7 on your PC, and you have an unused USB flash drive, then you can use ReadyBoost to speed up your system. Using a fairly new concept, ReadyBoost, allows you to use flash memory—like a USB flash drive or a memory card—to virtually add system memory and improve performance without having to physically open your computer to add standard memory modules.
Check out this short video from Mike Agerbo of GetConnectedTV to get a better understanding of how ReadyBoost works in Windows 7.
Here are step-by-step instructions on how to turn ReadyBoost on or off …
Ready Boost is a feature on Windows 7 and Windows Vista that allows external memory to be used to improve system performance. Ready Boost can take advantage of USB storage devices, SD cards, or CompactFlash cards. Windows 7 can take advantage of up to 8 devices using Ready Boost. It also can make use of up to 256GB for additional memory use. Windows Vista can make use of up to 4GB. However, Microsoft states that Ready Boost uses a 2:1 compression ratio. This means that 2GB of memory could potentially hold 4GB of data.