CP/CMS inspired numerous other operating systems, including the CP/M microcomputer operating system, which uses a drive letter to specify a physical storage device. 
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. 5 ASSIGN, JOIN and SUBST in DOS and Windows. 2 Operating systems that use drive letter assignment.
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