ReadyBoost can speed up your computer by using storage space on most USB flash drives and flash memory cards.
1) Plug a flash drive or flash memory card into your computer recommended size is 1GB free memory.
2) Open My computer and go to Properties dialog box, click the ReadyBoost tab, and then do one of the following:
3) 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.
4) 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.
5 ) Click OK.