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  2. List of disk drive form factors - Wikipedia

    en.wikipedia.org/wiki/List_of_disk_drive_form...

    8-, 5.25-, 3.5-, 2.5-, 1.8- and 1-inch HDDs, together with a ruler to show the length of platters and read-write heads A newer 2.5-inch (63.5 mm) 6,495 MB HDD compared to an older 5.25-inch full-height 110 MB HDD. IBM's first hard drive, the IBM 350, used a stack of fifty 24-inch platters and was of a size comparable to two large refrigerators.

  3. Drive bay - Wikipedia

    en.wikipedia.org/wiki/Drive_bay

    They were 3 + 1 ⁄ 4 inches (82.6 mm) high, 5 + 3 ⁄ 4 inches (146.1 mm) wide, and up to 8 inches (203.2 mm) deep, used mainly for hard disk drives and floppy disk drives. This is the size of the internal (screwed) part of the bay, as the front side is actually 5 + 7 ⁄ 8 inches (149.2 mm). The difference between those widths and the name of ...

  4. Caliber - Wikipedia

    en.wikipedia.org/wiki/Caliber

    medium-bore refers to calibers with a diameter of 0.33 inches (8.4 mm) to 0.39 inches (9.9 mm) large-bore refers to calibers with a diameter of 0.40 inches (10 mm) or larger There is much variance in the use of the term "small-bore", which over the years has changed considerably, with anything under 0.577 inches (14.7 mm) considered "small-bore ...

  5. United States Mint coin sizes - Wikipedia

    en.wikipedia.org/wiki/United_States_Mint_coin_sizes

    17.9 mm 2.5 g 1796–1964 $2.50 Gold Quarter Eagle 18 mm 4.2 g 1796–1929 Small Cent 19.05 mm 2.5 g 1943 Small Cent 19.05 mm 3.11 g 1864-1982 Small Cent 19.05 mm 4.67 g 1856-1864 2.5 g 1982–present Three Dollar 20.5 mm 5.01 g 1853–1876 Nickel 21.21 mm 5 g 1866–present Nickel 21.21 mm 5 g 1942–1945 Twenty Cent 22 mm 5 g 1875–1878 $5 ...

  6. Springfield Armory XD - Wikipedia

    en.wikipedia.org/wiki/Springfield_Armory_XD

    The .45 ACP XD-S has a 5+1 capacity (with optional 6+1 and 7+1 magazines) and a 3.3-inch (84 mm) barrel. In January 2013, an XD-S chambered in 9×19mm Parabellum (9mm) was introduced. It is the same as the .45 ACP model, the only difference being that the 9mm XD-S has a 7+1 capacity (with optional 8+1 and 9+1 magazines) and is marginally ...

  7. Gear inches - Wikipedia

    en.wikipedia.org/wiki/Gear_inches

    For example, consider a 700c × 23 mm tire, which has a nominal cross-section of 23 mm. 700c wheels have a rim diameter of 622 mm. Hence the wheel diameter is (2 × 23 mm) + 622 mm = 668 mm which is equal to 26.3 inches (rounded to 1 decimal place). 26 inch mountain bicycle wheels have a rim diameter of 559 mm. This ignores factors that ...

  8. Hard disk drive - Wikipedia

    en.wikipedia.org/wiki/Hard_disk_drive

    The 1301 consisted of one (for Model 1) or two (for model 2) modules, each containing 25 platters, each platter about 1 ⁄ 8-inch (3.2 mm) thick and 24 inches (610 mm) in diameter. [32] While the earlier IBM disk drives used only two read/write heads per arm, the 1301 used an array of 48 [ l ] heads (comb), each array moving horizontally as a ...

  9. 5-inch/54-caliber Mark 42 gun - Wikipedia

    en.wikipedia.org/wiki/5-inch/54-caliber_Mark_42_gun

    United States naval gun terminology indicates the gun fires a projectile 5 inches (127.0 mm) in diameter, and the barrel is 54 calibers long (barrel length is 5" × 54 = 270" or 6.9 meters.) [1] In the 1950s, a gun with more range and a faster rate of fire than the 5"/38 caliber gun used in World War II was needed; therefore, the gun was ...