(1) Additional information which follows a block of data either on disk or for the purpose of data transfer between devices. The tail usually serves as a full stop to the data that precedes it. Commonly encountered in MIDI System-Exclusive transfers. For example, in Yamaha System-Exclusive transfers, the last two bytes are tail information in the form of an ECC and an EOX status byte.
(2) The end of a reel of tape or film.