Dumper and Backup Tape Formats

This reference guide details the record formats for the LCG tape utilities, specifically Dumper and Backup. It is intended for experienced MACRO programmers and system maintainers to understand how data is structured on tape, including headers, data areas, and specific record types for both utilities. The document covers standard and Interchange tape formats, explaining how data is packed, sequence numbers are handled, and how directory information is stored. It also serves as a debugging aid for diagnosing potential corruption on tape media.