Windows ReadyBoost can use the storage space some devices Removable , such as USB flash drives , to speed up the computer. When you insert a device with this capacity, the dialog box Autoplay offers you the option to speed up the system using Windows ReadyBoost. If you select this option, you can choose how much memory should be used for this purpose. However, in some cases you can use all memory of storage device to speed up the computer.
Some storage devices universal serial bus (USB) contain Flash memory slow and fast, but Windows can only use fast flash memory to speed up the computer. In this way, if the device contains both slow memory as quickly, keep in mind that only you can use the fast memory for this purpose.
The amount of memory recommended acceleration Windows ReadyBoost is one to three times greater than the quantity of random access memory (RAM) installed on your computer. For example, if the computer has 512 megabytes (MB) of RAM and connect a USB flash drive 4 gigabytes (GB), reserve 512 MB to 1,5 GB of this unit for optimal performance. For the USB flash drive work correctly on Windows ReadyBoost, you must have 256 MB.
The above sentence is important. To benefit from Ready boost you should really have at least 1.5 gigs of flash to use. Since you shouldn’t run Vista on less than 1 gig, you should really have atleast 2 gigs to allocate to ReadyBoost.
For best results use a Class 6 Memory Stick, as these are the fastest of the Flash drives.
You can enable or disable Windows ReadyBoost for a specific flash drive or other removable storage device.