The key for a type T tape table of contents record for a tape backup volume is a two-character representation of the volume assignment (01–31 for daily, SP for spill, and UN for unassigned), followed by a dash (-), the volume serial number, a dash (-), and a four-character sequence number. An example of the key used with a T tape table of contents record for spill volume TAPE01 is:

FIXCDS T SP-TAPE01-0000