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  2. Optical storage media writing and reading speed - Wikipedia

    en.wikipedia.org/wiki/Optical_storage_media...

    Disc quality: optical disc recorders detect the available speed options based on the data which is available on the disc itself. However, some low-quality discs make a high-speed option available to the software, while the burning process can never reach that speed in practice. The reading and writing process may not happen at a steady speed.

  3. Floppy disk - Wikipedia

    en.wikipedia.org/wiki/Floppy_disk

    8-inch floppy disk, inserted in drive, (3½-inch floppy diskette, in front, shown for scale) 3½-inch, high-density floppy diskettes with adhesive labels affixed The first commercial floppy disks, developed in the late 1960s, were 8 inches (203.2 mm) in diameter; [4] [5] they became commercially available in 1971 as a component of IBM products and both drives and disks were then sold ...

  4. History of the floppy disk - Wikipedia

    en.wikipedia.org/wiki/History_of_the_floppy_disk

    Each side of a double-density disk held 180 KB for a total of 360 KB per disk, and 720 KB for quad-density disks. [40] Unlike 5 + 1 ⁄ 4-inch or 3 + 1 ⁄ 2-inch disks, the 3-inch disks were designed to be reversible and sported two independent write-protect switches. It was also more reliable thanks to its hard casing.

  5. Universal Disk Format - Wikipedia

    en.wikipedia.org/wiki/Universal_Disk_Format

    Universal Disk Format (UDF) is an open, vendor-neutral file system for computer data storage for a broad range of media. In practice, it has been most widely used for DVDs and newer optical disc formats, supplanting ISO 9660.

  6. Phonograph record - Wikipedia

    en.wikipedia.org/wiki/Phonograph_record

    Three vinyl records of different formats, from left to right: a 12 inch LP, a 10 inch LP, a 7 inch single. A phonograph record (also known as a gramophone record, especially in British English) or a vinyl record (for later varieties only) is an analog sound storage medium in the form of a flat disc with an inscribed, modulated spiral groove.

  7. Compact Disc Digital Audio - Wikipedia

    en.wikipedia.org/wiki/Compact_Disc_Digital_Audio

    Compact Disc Digital Audio (CDDA or CD-DA), also known as Digital Audio Compact Disc or simply as Audio CD, is the standard format for audio compact discs. The standard is defined in the Red Book technical specifications , which is why the format is also dubbed "Redbook audio" in some contexts. [ 1 ]

  8. Mohs scale - Wikipedia

    en.wikipedia.org/wiki/Mohs_scale

    Mohs hardness kit, containing one specimen of each mineral on the ten-point hardness scale. The Mohs scale (/ m oʊ z / MOHZ) of mineral hardness is a qualitative ordinal scale, from 1 to 10, characterizing scratch resistance of minerals through the ability of harder material to scratch softer material.

  9. DVD region code - Wikipedia

    en.wikipedia.org/wiki/DVD_region_code

    The values of each region that the disc is not encoded for are added together to give the value in the file. For example, a disc that is encoded for Region 1 but not Regions 2–8 will have the value 2+4+8+16+32+64+128=254. A disc encoded for Regions 1, 2 and 4 will have the value 4+16+32+64+128=244.

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