VSAM omvat vier toegangsmethoden:* Key Sequenced Data Set (KSDS),* Relative Record Data Set (RRDS),* Entry Sequenced Data Set (ESDS) en* Linear Data Set (LDS). ###>Originally a record-oriented filesystem., VSAM comprises four data set "organizations": Key Sequenced Data Set (KSDS), Relative Record Data Set (RRDS), Entry Sequenced Data Set (ESDS) and Linear Data Set (LDS).