区分替换：加快磁碟存取资料的方法。

Sector mapping: a method of speeding up disc access time.

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指定记忆体对应档的存取权限，这个档案不会与磁碟上的档案相关联。

Specifies access rights to a memory-mapped file that is not associated with a file on disk.

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同时，其他的执行绪可以存取磁碟档案或从通讯连接埠取得资料。

At the same time, other threads can access disk files or get data from a communications port.

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