(1) Removing a data set control block (DSCB) and releasing its space. A tape data set generally is considered to be deleted when its volume or volumes are made available for reuse or destruction. For both disk and tape, deletion generally also includes removing the data set's entry from the catalog DSCB.
(2) In DFSMShsm, the space management technique of deleting data sets, not managed by the storage management subsystem (SMS), that have not been used for a specified number of days and do not have expiration date protection.