se> (VsAM) An IBM disk file storage scheme first used in s/370 and virtual storage. VsAM comprises three access methods: Keyed sequenced Data set (KsDs), {Relative Record Data set} (RRDs), and {Entry sequenced Data set} (EsDs). Both IMs/DB and DB2 are implemented on top of VsAM and use its underlying data structures. ["storage" or "sequential"?] (2002-07-26)