In the DBF file, the widths of logic, date, comment and general fields are fixed. The width is as follows: logical type accounts for 1 byte, date type accounts for 8 bytes, remark type accounts for 4 bytes (access address for storing data content in FTP file and actual content in FPT file), and general type accounts for 4 bytes (access address for storing data content in FTP file and actual content in FPT file).