MAGNETICTAPE·STANDARD FORSEQUENTIALFILESSPOOLOEPLASTICTAPECOVEREDWITHFERROUSOXIDE(2400feetperspool)·RECORDGROUPS:BLOCKINGFACTOR(e.g-,10recordsperblock)GROUPSSEPARATEDBYINTER-BLOCKGAPRECORDSREADBLOCKATATIME大HEADERI IBGIBLOCK1BLOCK2BLOCK36.32• STANDARD FOR SEQUENTIAL FILES • SPOOL OF PLASTIC TAPE COVERED WITH FERROUS OXIDE (2400 feet per spool) • RECORD GROUPS: BLOCKING FACTOR (e.g., 10 records per block) • GROUPS SEPARATED BY INTER-BLOCK GAP • RECORDS READ BLOCK AT A TIME * HEADER IBG BLOCK 1 BLOCK 2 BLOCK 3 MAGNETIC TAPE 6.32