The File System
The Linux file system can be thought of as a single abstract "tree." When you add files on a removable device—such as a floppy drive or CD-ROM—or a remote system, these subsidiary file systems are "grafted" onto the original file system at a mount point.
Mount points are usually empty directories.
A mount point—and, indeed, the entire abstract tree—has no relationship with physical reality. This behavior is different than in Microsoft Windows, where the files and directories on drive E are all on the logical or physical drive E.
Actually, the term file system has two meanings:
The entire Linux abstract file system
A subsection, or "branch," of the file system tree: in other words, a directory, possibly with subdirectories
Generally, ...
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