ReadyBoost is Windows Vista feature that allows the user to plug a USB flash memory device into a USB 2.0 port on the PC and use it as a cache or virtual memory. The advantage being that it is much faster to cache to the USB drive than caching to your hard disk, speeding up your system and enhancing overall performance. Acting as a fast store for frequently accessed data, the average random 4K read from a flash device is about ten times faster than accessing the same information from the hard drive.

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