Provides the information necessary to allow physical interchange of a self-loading cartridge to be used with 1/2-inch-wide magnetic tape, as described in American National Standard for Unrecorded Magnetic Tape for Information Interchange (9-Track 200 and 800 CPI, NRZI, 1600 CPI, PE), INCITS 40, and modified herein, when contained in a self-loading cartridge.