Virtual disks have all the performance characteristics of physical disks. They exist on a physical disk within a 'container file', which is a contiguous file, whose number of blocks determines the size of the virtual disk. One container file is required for each virtual disk. On this system, the container files are located on DR0:[1,76]. This is not a requirement. Virtual disks are mounted and dismounted just like any other file structured device. They must be initialized to create a home block and index structure, again just like any other disk. Once created and mounted, they behave just as would a 'real' disk and answer to the device mnemonic and unit VDn:. For help in using an existing virtual disk, type HELP VIRTUAL_DISK USAGE For help in creating virtual disk from scratch, type HELP VIRTUAL_DISK CREATE Help is available on the virtual disk utilities. Type HELP AVD or HELP DVD 2 USAGE Existing virtual disks are allocated and mounted by: AVD VDn:=DR:[1,76] MOU VDn:/OVR where is the name of the container file for the virtual disk. Existing virtual disks are deallocated and demounted by: DMO VDn:/DEV DVD VDn: 2 CREATE To create a virtual disk from scratch: AVD VDn:=DR:[1,76]/CR: SET /NOPUB=VDn: ALL VDn: MOU VDn:/FOR INI VDn: DMO VDn:/DEV DEA VDn: SET /PUB=VDn: MOU VDn:/OVR where is the container file to create. (extension defaults to .DSK) is the decimal number of blocks to allocate the container file is the volume id for the virtual disk (normally the same as to avoid confusion)