The BTRMAXREC environment variable specifies the maximum record size.
You can set BTRMAXREC using the following command:
set BTRMAXREC=nnnn
where nnnn is a byte value specifying the maximum record length.
You should set BTRMAXREC to the record size of the largest record to be accessed.
If you do not set BTRMAXREC, the default value of 32 Kilobytes is used.
You can specify the value of BTRMAXREC on a per-file basis using the xfh2btr configuration file.