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The designation C: (sometimes C:\\) is the drive letter that refers to the main partition (or portion of a hard drive) on a MS-DOS or Windows personal computer. It contains all of the operating system files required for operation of the computer. On many modern personal computers only one hard drive is included in the design so it is designated C:\\. On such a computer, all of a user's personal files are stored in directories on this drive.

MS-DOS and Windows typically label drives as follows:

See also: Drive letter assignment