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2. IBM 7-track - Wikipedia

   en.wikipedia.org/wiki/IBM_7-track

   An IBM 704 mainframe with IBM 727 7-track tape drives on the left Reel of 1/2" tape showing beginning-of-tape reflective marker A write-protection ring had to be inserted in the back of a reel to allow its tape to be written on. A reel of half-inch magnetic tape being loaded onto an IBM 729 tape drive that is attached to an IBM 1401 being ...

3. IBM 729 - Wikipedia

   en.wikipedia.org/wiki/IBM_729

   A 3/4 inch gap between records allowed the mechanism enough time to stop the tape. Initial tape speed was 75 inches per second (2.95 m/s) and recording density was 200 characters per inch, giving a payload transfer speed of 90 kbit/s (105 kbit/s including parity bits).

4. IBM 727 - Wikipedia

   en.wikipedia.org/wiki/IBM_727

   The IBM 727 Magnetic Tape Unit was announced for the IBM 701 and IBM 702 on September 25, 1953. It became IBM's standard tape drive for their early vacuum-tube era computer systems. Later vacuum-tube machines and first-generation transistor computers used the IBM 729-series tape drive. The 727 was withdrawn on May 12, 1971. [1]

5. 9-track tape - Wikipedia

   en.wikipedia.org/wiki/9-track_tape

   9-track tape is a format for magnetic-tape data storage, introduced with the IBM System/360 in 1964. The 1 ⁄ 2 inch (12.7 mm) wide magnetic tape media and reels have the same size as the earlier IBM 7-track format it replaced, but the new format has eight data tracks and one parity track for a total of nine

6. Magnetic-tape data storage - Wikipedia

   en.wikipedia.org/wiki/Magnetic-tape_data_storage

   This translates into about 5 megabytes to 140 megabytes per standard length (2,400 ft, 730 m) reel of tape. Effective density also increased as the interblock gap (inter-record gap) decreased from a nominal 3 ⁄ 4 inch (19 mm) on 7-track tape reel to a nominal 0.30 inches (7.6 mm) on a 6250 bpi [clarification needed] 9-track tape reel. [12]

7. Audio tape specifications - Wikipedia

   en.wikipedia.org/wiki/Audio_tape_specifications

   A seven-inch reel of 1 ⁄ 4 in (6.4 mm) tape. The tape decks of the 1950s were mainly designed to use tape 1 ⁄ 4 inch (0.64 cm) wide and to accept one of two reel formats: 10 + 1 ⁄ 2 inches (27 cm) reels, almost always with metal flanges, which fit