In MS-DOS, the codice_1 command was added with the release of MS-DOS 3.1. The command is similar to floating drives, a more general concept in operating systems of Digital Research origin, including CP/M-86 2.x, Personal CP/M-86 2.x, Concurrent DOS, Multiuser DOS, System Manager 7, REAL/32, as well as DOS Plus and DR DOS (up to 6.0). DR DOS 6.0 includes an implementation of the command. The command is also available in FreeDOS and PTS-DOS. The Windows codice_1 command is available in supported versions of the command line interpreter cmd.exe. In Windows NT, codice_1 uses codice_5 to create the disk mappings.