What do file system caches and pre-fetches?

Please tell me what do file system caches and pre-fetches?
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•single files, directories, subtrees, partitions, ...•permanent or only at certain points in time . Source:
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The prefetch control makes it possible for a file to be downloadable prior to a military action starts. You no longer need A corresponding keep on in the event that declaration for that record to get delivered electronically as well as checkered in advance. The particular prefetch order is preferred within the down load command
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