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Concept
Directory structure
Summary
In computing, a directory structure is the way an operating system arranges that are accessible to the user. Files are typically displayed in a hierarchical tree structure.
A is a string used to uniquely identify a file stored on this structure. Before the advent of 32-bit operating systems, file names were typically limited to short names (6 to 14 characters in size). Modern operating systems now typically allow much longer filenames (more than 250 characters per pathname element).
slash (punctuation) and backslash
In CP/M, DOS, Windows, and OS/2, the root directory is "drive:", for example on modern systems, the root directory is usually "C:". The directory separator is usually a "", but many operating systems also internally recognizes a "/". Physical and virtual drives are named by a drive letter, as opposed to being combined as one. This means that there is no "formal" root directory, but rather that there are independent root directories on each drive. However, it is possible to combine two drives into one virtual drive letter, by setting a hard drive into a RAID setting of 0.
The following folders may appear in the root of a boot partition.
Unix directory structure
Although Unix does not have a single standard for directory structures, in most implementations, files and directories appear under the root directory "/", even if they are stored on different physical devices.
Official source
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