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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 ...
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.
A disc brake is sometimes employed as a drag brake for controlled speed reduction on steep descents. Many hydraulic disc brakes have a self-adjusting mechanism so as the brake pad wears, the pistons keep the distance from the pad to the disc consistent to maintain the same brake lever throw.
All PDGA-approved discs measure 21–30 cm (8.3–11.8 in) in diameter and weigh no more than 200 g (7.1 oz). Discs used for disc golf are designed and shaped for control, speed, and accuracy, while general-purpose flying discs, such as those used for playing guts or ultimate, have a more traditional shape, similar to a catch disc. There is a ...
In many species, the gular skin forms a flap, or gular pouch, which is generally used to store fish and other prey while hunting. In many others, such as frigatebirds , the gular skin may overlie a sac —the gular sac or throat sac —that may be dramatically inflated by males during courtship display.
In American television in 2023, notable events included television show debuts, finales, and cancellations; channel launches, closures, and re-brandings; stations changing or adding their network affiliations; information on controversies, business transactions, and carriage disputes; and deaths of those who made various contributions to the medium.
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