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In the US, size names are often denoted with a code of the format nR, where the number n represents the length of the shorter edge in inches. In the normal series, the long edge is the length of the short edge plus 2 inches (10 in or less) or 3 inches (11 in and above).
Common in large and medium format photography ('6x7' cameras, actual size 56 mm × 70 mm (2.2 in × 2.8 in)), which fits the common print paper size of 8 in × 10 in (20.3 cm × 25.4 cm) without cropping and is still in common use for prints from digital cameras.
The f-number N is given by: = where f is the focal length, and D is the diameter of the entrance pupil (effective aperture).It is customary to write f-numbers preceded by "f /", which forms a mathematical expression of the entrance pupil's diameter in terms of f and N. [1]
5.75 in × 3.25 in × 8 in (146.1 mm × 82.55 mm × 203 mm). This smaller form factor, first used in an HDD by Seagate in 1980, was the same size as full-height 5 + 1 ⁄ 4-inch-diameter (130 mm) FDD, 3.25-inches high.
8.0-inch drive bays were found in early IBM computers, CP/M computers, and the TRS-80 Model II.They were 4 + 5 ⁄ 8 inches (117.5 mm) high, 9 + 1 ⁄ 2 inches (241.3 mm) wide, and approximately 14 + 1 ⁄ 4 inches (361.9 mm) deep, and were used for hard disk drives and floppy disk drives.
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 ...
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