VARRECBLKSZ, Blocksize must be at least record size + 4 bytes
Run Time Error: This indicates that an OPEN command attempted to initialize a variable-length magnetic tape or sequential disk file with a RECORDSIZE of less than 5 bytes.
Action: Modify the routine to use a larger record size or use FIXED length records. The minimum variable RECORDSIZE reflects a single byte of data and 4 bytes of overhead in every variable-length record.
