Root directory
First or top-most directory in a hierarchy / From Wikipedia, the free encyclopedia
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For other uses, see Root (disambiguation).
In a computer file system, and primarily used in the Unix and Unix-like operating systems, the root directory is the first or top-most directory in a hierarchy.[1] It can be likened to the trunk of a tree, as the starting point where all branches originate from. The root file system is the file system contained on the same disk partition on which the root directory is located; it is the filesystem on top of which all other file systems are mounted as the system boots up.[2]