Special multi-jackbolt piston end nuts and crosshead jamnuts are used to ease the installation of piston rods, especially considering space limitations. Other applications include anchor bolts, flexible disk couplings, dehydration towers, compressor cylinders, compressor doghouse bolting, end plates, and gas compression engines.
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By 1988, the -inch was outselling the -inch.1991 DISK/TREND REPORT, FLEXIBLE DISK DRIVES, Figure 2 In South Africa, the -inch format was generally called a stiffy disk, to distinguish it from the flexible 5½-inch format. The term "-inch" or "3.5-inch" disk is and was rounded from the 90 mm actual dimension of one side of the rectangular cartridge. The actual disk diameter is .
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In 1981 they moved all operations to Dallas, Texas except technical services and repair which stayed in Garland, Texas.Percom to Move, InfoWorld, 28 Sep 1981, Page 5Contracts, Computerworld, 13 Apr 1981, Page 98, ...Micro Peripherals, Inc. has received an order worth nearly $2 million from Percom Data Co. for 10,000 miniature flexible disk drives. The MPI drives will be used in minidisk storage systems manufactured by Percom...
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IBM DemiDiskette media and Model 341 FDD In the early 1980s, IBM Rochester developed a 4-inch floppy disk drive, the Model 341 and an associated diskette, the DemiDiskette. This program was driven by aggressive cost goals, but missed the pulse of the industry. The prospective users, both inside and outside IBM, preferred standardization to what by release time were small cost reductions, and were unwilling to retool packaging, interface chips and applications for a proprietary design. The product was announced and withdrawn in 19831983 Disk/Trend Report - Flexible Disk Drives, December 1983 p.
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38 A sequence of pictures showed how he used a drill press to rapidly remove wood inside concave parts of bowls, trays, and spoons. He would then refine the roughed out concave forms with a mallet and wood gouges, before power sanding with flexible disk attachments—thus using a power tool, hand tools, and then another power tool in rapid succession. He devised tools and techniques for increasing speed and efficiency without sacrificing workmanship. He made flat templates of his commonly produced works to rapidly transfer outlines onto wood blanks.
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Things changed dramatically in 1982 when the Microfloppy Industry Committee (MIC), a consortium ultimately of 23 media companies, agreed upon a -inch media specification based upon but differing from the original Sony design."The Microfloppy—One Key to Portability," Thomas R. Jarrett, Computer Technology Review, Winter 1983 (Jan 1984), pp 245-247 The first single-sided drives compatible with this new media specification shipped in early 1983,1983 DISK/TREND REPORT, , FLEXIBLE DISK DRIVES followed immediately in 1984 by double-sided compatible versions. In 1984, Apple Computer selected the format for their new Macintosh computers. Then, in 1985, Atari adopted it for their new ST line, and Commodore for their new Amiga.
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The Macintosh External Disk Drive is the original of a series of external -inch floppy disk drives manufactured and sold by Apple Computer exclusively for the Macintosh series of computers introduced in January 1984. Later, Apple would unify their external drives to work cross-platform between the Macintosh and Apple II product lines, dropping the name "Macintosh" from the drives. Though Apple had been producing external floppy disk drives prior to 1984, they were exclusively developed for the Apple II, III and Lisa computers using the industry standard -inch flexible disk format. The Macintosh external drives were the first to widely introduce Sony's new -inch rigid disk standard commercially and throughout their product line.
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Few products in history have enjoyed such spectacular declines in cost and physical size along with equally dramatic improvements in capacity and performance. IBM manufactured 8-inch floppy disk drives from 1969 until the mid-1980s, but did not become a significant manufacturer of smaller-sized, 5.25- or 3.5-inch floppy disk drives (the dimension refers to the diameter of the floppy disk, not the size of the drive).1986 Disk/Trend Report – Flexible Disk Drives shows IBM production only of 8-inch FDDs and states, IBM will end internal production of 8-inch drives by 1987. IBM always offered its magnetic disk drives for sale but did not offer them with original equipment manufacturer (OEM) terms until 1981.
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8-inch, -inch, and -inch floppy disks 8-inch, -inch (full height), and -inch drives A -inch floppy disk removed from its housing A floppy disk or floppy diskette (sometimes casually referred to as a floppy or diskette) is a type of disk storage composed of a thin and flexible disk of a magnetic storage medium in a square or nearly square plastic enclosure lined with a fabric that removes dust particles from the spinning disk. Floppy disks are read from and written to by a floppy disk drive (FDD). The first floppy disks, invented and made by IBM, had a disk diameter of . Subsequently and then inch (90 mm) became a ubiquitous form of data storage and transfer into the first years of the 21st century.
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It was marketed as a backup and portable storage solution, similar to the original Zip drive, but which could be installed completely inside a laptop computer, as PC cards typically slide completely inside the laptop computer and thus do not increase its dimensions, which also precludes the need for a power supply or cables. The PocketZip media is a small, flexible disk inside of a thin metal casing, similar to that found on the shutter of a standard floppy disk. The disks usually came in small format-specific plastic cases, and the drive was also shipped for a while with a small hard metal case - identical, but unrelated to the Aluma Wallet - which could house the drive and two disks. The disks could be bent easily if too much force was applied, thereby completely damaging them.
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The drive spins a PET film floppy disk at about 3000 rpm, 1 μm over a read-write head, using Bernoulli's principle to pull the flexible disk towards the head as long as the disk is spinning. In theory this makes the Bernoulli drive more reliable than a contemporary hard disk drive, since a head crash is impossible. The original Bernoulli disks came in capacities of 5, 10, and 20 MB. They are roughly 21 cm by 27.5 cm, similar to the size of a sheet of A4 paper. The most popular system was the Bernoulli Box II, whose disk cases are 13.6 cm wide, 14 cm long and 0.9 cm thick, somewhat resembling a 3-inch standard floppy disk but in 5-inch form factor. Bernoulli Box II disks came in the following capacities: 20 MB, 35 MB, 44 MB, 65 MB, 90 MB (late 1980s), 105 MB, 150 MB, and in 1993, 230 MB. There are five types of drives, grouped by the maximum readable capacity: 20 MB, 44 MB, 90 MB, 150 MB, and 230 MB. The interface is usually SCSI.
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