ReadyBoost can speed up your system without having to purchase extra internal RAM. Please watch the Video below to Learn How to Enable Ready Boost in Windows 7.
To turn ReadyBoost off, click Do not use this device.
To use the maximum available space on the flash drive or memory card for ReadyBoost , click Dedicate this device to ReadyBoost. Windows will leave any files already stored on the device, but it'll use the rest to boost your system speed.
To use less than the maximum available space on the device for ReadyBoost , click Use this device, and then move the slider to choose the amount of available space on the device you want to use.