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2. Video Cassette Recording - Wikipedia

   en.wikipedia.org/wiki/Video_Cassette_Recording

   The VCR format used large square cassettes with 2 co-axial reels, one on top of the other, containing 1 ⁄ 2-inch-wide (12.7 mm) chrome dioxide magnetic tape. Three playing times were available: 30, 45 and 60 minutes.

3. Ampex 2-inch helical VTR - Wikipedia

   en.wikipedia.org/wiki/Ampex_2-inch_helical_VTR

   The 2-inch-wide video tape used was one mil (0.001 in or 0.0254 mm) thick. The VTRs were mostly used by industrial companies, educational institutions, and a few for in-flight entertainment . The capstan tape speed is 3.7 inches per second, which provided a long record time of up to five hours on large reels.

4. Compact Cassette tape types and formulations - Wikipedia

   en.wikipedia.org/wiki/Compact_Cassette_tape...

   Remanence of audio tapes, referred to quarter-inch tape width, varies from around 1100 G for basic ferric tapes to 3500 G for Type IV tapes; [5] advertised remanence of the 1986 JVC Type IV cassette reached 4800 G. [6] Coercivity is a measure of the external magnetic flux required to magnetize the tape, and an indicator of the necessary bias level.

5. Video tape recorder - Wikipedia

   en.wikipedia.org/wiki/Video_tape_recorder

   A video tape recorder (VTR) is a tape recorder designed to record and playback video and audio material from magnetic tape. The early VTRs were open-reel devices that record on individual reels of 2-inch-wide (5.08 cm) tape.

6. Quadruplex videotape - Wikipedia

   en.wikipedia.org/wiki/Quadruplex_videotape

   2-inch quadruplex videotape (also called 2" quad video tape or quadraplex) was the first practical and commercially successful analog recording video tape format. [1] It was developed and released for the broadcast television industry in 1956 by Ampex, an American company based in Redwood City, California. [2]

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