You can define the organization and record specification of the data set with specific operands as follows. When you omit these operands, the system uses default values.

• DSORG (Data Set Organization) - specifies the organization of the data set, for example, physical sequential (PS) or partitioned (PO).
• RECFM (Record Format) - specifies the characteristics of the records in the data set, for example, fixed-length (F), variable-length (V), and blocked (B).
• LRECL (Record Length) - specifies the length in bytes of each record in the data set. If the records are variable-length, specify the maximum record length.
• BLKSIZE (Block Size) - specifies how many bytes the system is going to read or write at a time. If the data set contains fixed block or variable block records, the block size must be a multiple of the record length. For example, if you have a fixed block record length of 80, the block size can be 3200 (40 x 80) or any other multiple of 80.

ALLOCATE DATASET(new.data) NEW DIR(4) BLOCK(800) SPACE(20,10)
  DSORG(po) RECFM(f,b) LRECL(80) BLKSIZE(3200)