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  2. Unusual types of gramophone records - Wikipedia

    en.wikipedia.org/wiki/Unusual_types_of...

    The 3-inch spindle format would be resurrected some 40 years later for the Holy Bible Old and New Testaments produced at 16 RPM by the Audio Book Company of St. Joseph, Michigan. The rarest edition comes with a fibreboard insert to adapt the 3-inch hole of the vinylite discs to a standard phonograph hole. [citation needed]

  3. Track (optical disc) - Wikipedia

    en.wikipedia.org/wiki/Track_(optical_disc)

    Each sector (or "timecode frame") consists of a sequence of channel frames. These frames, when read from the disc, are made of a 24-bit synchronization pattern with the constant sequence 1000-0000-0001-0000-0000-0010, not present anywhere else on the disc, separated by three merging bits, followed by 33 bytes in EFM encoding, each followed by 3 merge bits.

  4. Universal Media Disc - Wikipedia

    en.wikipedia.org/wiki/Universal_Media_Disc

    The Universal Media Disc (UMD) is a discontinued optical disc medium developed by Sony for use on its PlayStation Portable handheld gaming and multimedia platform. It can hold up to 1.8 gigabytes of data and is capable of storing video games, feature-length films, and music.

  5. Optical disc packaging - Wikipedia

    en.wikipedia.org/wiki/Optical_disc_packaging

    Beginning in 2007, prerecorded Blu-ray and HD DVD titles ship in packages similar to but slightly smaller (18.5 mm shorter and 1 mm thinner: 135 mm × 171.5 mm × 13 mm) [31] than a standard DVD keep case, generally with the format logo prominently displayed in a horizontal stripe across the top of the case (red for HD DVD; and PlayStation 3 ...

  6. Mini CD - Wikipedia

    en.wikipedia.org/wiki/Mini_CD

    The disc may be rectangular with wings added on, to square off the rounded 80 mm disc. 60 mm disc , a round version of the business card, with comparable capacity (50 MB) In 1997, Dean Procter of Imaginet was offering business card sized square CDs with full screen hi-fi stereo video which played in quad speed CD-ROM or DVD drives with the ...

  7. Optical disc - Wikipedia

    en.wikipedia.org/wiki/Optical_disc

    An optical disc is a flat, usually [note 1] disc-shaped object that stores information in the form of physical variations on its surface that can be read with the aid of a beam of light. Optical discs can be reflective, where the light source and detector are on the same side of the disc, or transmissive, where light shines through the disc to ...

  8. Flexi disc - Wikipedia

    en.wikipedia.org/wiki/Flexi_disc

    ABBA/Live 77 was a special single-sided promo gold flexi disc given as a bonus to children who sold magazines and books at Christmas for Jultidningsförlaget, a publishing company using door sales as their main distribution channel. The disc contained excerpts from the Swedish group's recent concert appearance in Australia.

  9. 45 rpm adapter - Wikipedia

    en.wikipedia.org/wiki/45_rpm_adapter

    A plastic 45 rpm adapter that inserts into the large spindle hole of a 45 rpm record. A 45 rpm adapter (also known as a 45 rpm record insert, 45 rpm spindle adapter, spider, or 7-inch adapter in reference the usual size of a 45 rpm record) is a small plastic or metal insert that goes in the middle of a 45-rpm record so it can be played on the standard size spindle of a turntable.