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A fire hydrant marked as 3-inch. The inch (symbol: in or ″) is a unit of length in the British Imperial and the United States customary systems of measurement.It is equal to 1 / 36 yard or 1 / 12 of a foot.
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.
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 ...
5 1 ⁄ 4 inch Single 1 40 18 128 soft 90 kB 288 FM [NB 5] Dual 26 128 130 kB MFM Double 18 256 180 kB Double 2 18 256 360 kB 300 Atari ST/TT/Falcon 3 1 ⁄ 2 inch Double 1 80 9 512 soft 360 kB 300 MFM 2 720 kB High 18 1,440 kB Coleco ADAM: 5 1 ⁄ 4 inch Double 1 40 8 512 soft 160 kB 300 MFM Commodore 64 (8-bit) 5 1 ⁄ 4 inch Double 1 35
A Maxell-branded 3-inch Compact Floppy Disk. The floppy disk is a data storage and transfer medium that was ubiquitous from the mid-1970s well into the 2000s. [1] Besides the 3½-inch and 5¼-inch formats used in IBM PC compatible systems, or the 8-inch format that preceded them, many proprietary floppy disk formats were developed, either using a different disk design or special layout and ...
The 5-inch (127 mm)/54-caliber (Mk 45) lightweight gun is a U.S. naval artillery gun mount consisting of a 5 in (127 mm) L54 Mark 19 gun on the Mark 45 mount. [1] It was designed and built by United Defense, a company later acquired by BAE Systems Land & Armaments, which continued manufacture.
Common aspect ratios for displays, past and present, include 5:4, 4:3, 16:10, and 16:9. To distinguish: The display aspect ratio (DAR) is calculated from the physical width and height of a display, measured each in inch or cm (Display size). The pixel aspect ratio (PAR) is calculated from the width and height of one pixel.
By 1988, the 3 + 1 ⁄ 2-inch was outselling the 5 + 1 ⁄ 4-inch. [69] In South Africa, the 3 + 1 ⁄ 2-inch format was generally called a stiffy disk, to distinguish it from the flexible 5 + 1 ⁄ 4-inch format. [70] [71] The term "3 + 1 ⁄ 2-inch" or "3.5-inch" disk is and was rounded from the 90 mm actual dimension of one side of the ...