计算机虚拟存储体系结构中磁盘文件访问存在局部性，大量访问集中在少数文件上。
Disk file accesses are localized just like RAM access localization in the virtual memory architecture. Most file accesses localize few files.
大的未压缩格式的图形文件可以消耗掉大量的磁盘空间和带宽量，从而延缓了访问时间。
The large graphic files, in uncompressed format, can consume enormous disk space and the amount of bandwidth, thus slowing down access time.
显然，对于磁盘上的物理文件和用来访问页面功能的URL而言，URL路径选择特性隔离了两者之间的关联关系。
The URL routing feature explicitly breaks the connection between physical files on disk and the URL that is used to access a given bit of functionality.
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