Patent ID: 7873781

Claim:
A method for selectively controlling reutilization of data space in a virtual tape system having a buffer and at least one multiple volume tape cartridge, the method comprising: a user transferring data volume files to the virtual tape system for the virtual tape system to store; the buffer receiving the data volume files transferred by the user and then transferring data making up the data volume files as virtual tape volumes to different locations of the at least one multiple volume tape cartridge for the at least one multiple volume tape cartridge to store; the user selectively designating a particular data volume file for the virtual tape system to automatically delete from storage after a predetermined expiration date included as part of the particular data volume file has elapsed by automatically deleting virtual tape volumes corresponding to the particular data volume file designated for automatic deletion from the at least one multiple volume tape cartridge, in order to allow the virtual tape system to automatically reuse the storage space of the at least one multiple volume tape cartridge corresponding to deleted virtual tape volumes of the particular data volume file designated for automatic deletion without any further action by the user; detecting if a data volume file received by the buffer and transferred by the buffer as virtual tape volumes to the at least one multiple volume tape cartridge for storage has been designated by the user for automatic deletion; and prohibiting the virtual tape system from automatically deleting the detected received data volume file from storage after a predetermined expiration date included as part of the detected received data volume file has elapsed if the detected received data volume file was not designated by the user for automatic deletion; and allowing the virtual tape system to delete the detected received data volume file from storage after the predetermined expiration date associated with the detected received data volume file has expired if the detected received data volume file was not designated by the user for automatic deletion.