buffer和cache

A buffer is something that has yet to be(有待) "written" to disk. A cache is something that has been "read" from the disk andstored for later use. Buffer的核心作用是用來緩衝，緩和衝擊。比如你每秒要寫100次硬盤，對系統衝擊很大，浪費了大量時間在忙着處

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