决定写访问由文件名，文件类型，目录和驱动器。
Determine write access by filename, file type, directory and drive.
把复杂的逻辑和物理拓扑显示为单一目录树(驱动器映射)，其中的子目录实际上可能位于远程服务器。
This complexity of logical and physical topology appears as a single directory tree (drive mapping), with sub-directories that may actually be located on remote servers.
Windows为硬盘驱动器分区和其他存储设备分配驱动器字母，而Linux在root文件结构中为它们分配目录。
Where Windows assigns drive letters to hard drive partitions and other storage devices, Linux assigns them directories in the root file structure.
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