fx files and saves the caching plan under HKLM\System\CurrentControlSet\Services\Ecache\Parameters in REG_BINARY values named for internal disk volumes they refer to. It stores the processed traces in %SystemRoot%\Prefetch\Readyboot as. It analyzes file trace information from the five previous boots and identifies which files were accessed and where they are located on disk. The size of the cache depends on the total RAM available, but is large enough to create a reasonable cache and yet allow the system the memory it needs to boot smoothly.Īfter every boot, the ReadyBoost service (the same service that implements the ReadyBoost feature just described) uses idle CPU time to calculate a boot-time caching plan for the next boot. Windows Vista uses the same boot-time prefetching as Windows XP did if the system has less than 512MB of memory, but if the system has 700MB or more of RAM, it uses an in-RAM cache to optimize the boot process. It stayes Vista,but it's probably the samefor Windows 7:
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