The first copy (see Figure 1) is performed by the direct memory access (DMA) engine, which reads file contents from the disk and stores them into a kernel address space buffer.

直接内存存取(direct memory access, DMA)引擎执行了第一次拷贝(参见图1)，它从磁盘中读取文件内容，然后将它们存储到一个内核地址空间缓存区中。

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If clients have a traditional SAN connection, they will retain the advantages of high-speed direct-disk access.

如果客户机有一个传统的SAN连接，它们将获得高速直接存取磁盘的优势。

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The term may also refer to the storage of data by the transfer processing system on media such as magnetic tape or disk such that the user may not have direct and immediate access to the data.

该术语也可指转帐处理系统将数据存储于如磁带、磁盘等介质上，使得用户不能直接和立即访问数据。

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