By default the VTS supports two logical volume sizes 400 MB and 800 MB which correspond to the supported 3490 media types: cartridge system tape (MEDIA1) and enhanced capacity cartridge system tape (MEDIA2). Using outboard policy management support, the default volume size can be overridden at the library through a data class policy specification. If a maximum volume size is specified in the assigned data class, that volume size will override the default volume size for the volume when it is first mounted. A logical volume's maximum volume size can then change when it is mounted as a scratch volume again. However, for TS7700 Virtualization Engine Release 1.6 or later, the logical volume's maximum size can change when the volume is written from load point, for either a scratch or private (specific) request. Prior to Release 1.6, the TS7700 retained the capacity of the logical volume (on reuse), unless the volume was mounted as a scratch volume. For additional information on the supported logical volume sizes, refer to the applicable tape library operator guide. In addition to this, application configuration-related changes may also be needed to fully utilize the larger logical volume sizes (TAPEPERCENTFULL or TAPECAPACITY-type specifications). Starting with Release 1.4 of the TS7700 Virtualization Engine (and only the TS7700 Virtualization Engine), support was put in place for the host (and associated applications) to obtain the logical volume size from the library. Refer to the applicable application-related documentation, for any added support in this area.