Magnetic Tape Specifications Magnetic Tape Specifications for 9-track tape, diskette, or 3480 cartridges.
Blanks are 'space' characters.
IBM standard header and trailer labels. Unlabeled tapes are a last resort. Blocking size of 8010. Multiple companies should be submitted on a single diskette or tape. If header and trailer labels are used, they must be separated from the data records by a tape mark and they must be the same density as the records.