The disk layout is the way file system information is stored on disk. On Veritas File System (VxFS), several disk layout versions, numbered 1 through 9, were created to support various new features and specific UNIX environments.

Currently, only the Version 7, 8, and 9 disk layouts can be created and mounted. The Version 6 disk layout can be mounted, but only for upgrading to a supported version. No other versions can be created or mounted.