Flash devices typically are slower than a mechanical hard disk for sequential I/O, so, to maximize performance, ReadyBoost includes logic that recognizes large, sequential read requests and has the hard disk service these requests.
This caching applies to all disk content, not just the page file or system DLLs. Using ReadyBoost-capable flash memory ( NAND memory devices) for caching allows Windows Vista and later to service random disk reads with better performance than without the cache.
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