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2. Letter (paper size) - Wikipedia

   en.wikipedia.org/wiki/Letter_(paper_size)

   The Reagan administration made Letter-size paper the norm for US federal forms in the early 1980s; previously, the smaller "official" Government Letter size, 8 by 10.5 inches (203.2 by 266.7 mm) (aspect ratio: 1.3125), was used in government, while 8.5-by-11-inch (215.9 by 279.4 mm) paper was standard in most other offices. [2]

3. ISO 216 - Wikipedia

   en.wikipedia.org/wiki/ISO_216

   Similarly, two sheets of A4 can be scaled down to fit one A4 sheet without excess empty paper. This system also simplifies calculating the weight of paper. Under ISO 536 , paper's grammage is defined as a sheet's mass in grams (g) per area in square metres (unit symbol g/m 2 ; the nonstandard abbreviation "gsm" is also used). [ 5 ]

4. 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 ...

5. Paper size - Wikipedia

   en.wikipedia.org/wiki/Paper_size

   The weight of an A-series sheet of a given paper weight can be calculated by knowing the ratio of its size to the A0 sheet. For example, an A4 sheet is 1 ⁄ 16 the size of an A0 sheet, so if it is made from 80-g/m 2 paper, it weighs 1 ⁄ 16 of 80 g, which is 5 g.

6. History of IBM magnetic disk drives - Wikipedia

   en.wikipedia.org/wiki/History_of_IBM_magnetic...

   In 2002 at the Magnetic Disk Heritage Center, a team [20] led by Al Hoagland began restoration of an IBM 350 RAMAC in collaboration with Santa Clara University. [21] In 2005, the RAMAC restoration project relocated to the Computer History Museum , Mountain View, California and is now demonstrated to the public in the museum's Revolution exhibition.

7. Neodymium magnet - Wikipedia

   en.wikipedia.org/wiki/Neodymium_magnet

   A neodymium magnet (also known as NdFeB, NIB or Neo magnet) is a permanent magnet made from an alloy of neodymium, iron, and boron to form the Nd 2 Fe 14 B tetragonal crystalline structure. [1] They are the most widely used type of rare-earth magnet .