1 DFHTCT TYPE=SDSCI ,DEVICE=device ,DSCNAME=name 2? ,BLKSIZE=length 3? 3 ,DDNAME= 3.1! name-in-DSCNAME 3.1? 3.1 name 4 ,MACRF= 5 R 5 W 6? 6 ,RECFM= 6.1! U 6.1? 6.1 F 6.1 V