CMS file system
The CMS file system is the native file system of IBM's Conversational Monitor System (CMS), a component of VM. It was the only file system for CMS until the introduction of the CMS Shared File System with VM/SP. == Minidisks == CP-67 and VM allow an installation to divide a disk volume into virtual disks called minidisks. A minidisk may be a CMS minidisk, initialized with the CMS file system.