Minidisks can correspond to physical disk drives, but more typically refer to logical drives, which are mapped automatically onto shared devices by the operating system as sets of virtual cylinders. A full file reference ( pathname in today's parlance) consists of a filename, a filetype, and a disk letter called a filemode (e.g. CP/CMS uses drive letters to identify minidisks attached to a user session.The concept evolved through several steps: The concept of drive letters, as used today, presumably owes its origins to IBM's VM family of operating systems, dating back to CP/CMS in 1967 (and its research predecessor CP-40), by way of Digital Research's (DRI) CP/M. Drive letter assignment is thus a process of using letters to name the roots of the "forest" representing the file system each volume holds an independent "tree" (or, for non-hierarchical file systems, an independent list of files). Unlike the concept of UNIX mount points, where volumes are named and located arbitrarily in a single hierarchical namespace, drive letter assignment allows multiple highest-level namespaces. In computer data storage, drive letter assignment is the process of assigning alphabetical identifiers to volumes. File Manager displaying the contents of drive C. MS-DOS command prompt with drive letter C as part of the current working directory. Alphabetical assignment to logical drives on computers (e.g., C:\)
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