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Each generation of floppy disk drive (FDD) began with a variety of incompatible interfaces but soon evolved into one de facto standard interface for the generations of 8-inch FDDs, 5.25-inch FDDs and 3.5-inch FDDs. [1]
When the controller and disk drive are assembled as one device, as it is the case with some external floppy disk drives, e.g., Commodore 1540 and USB floppy disk drives, [27] the internal floppy disk drive and its interface are unchanged, while the assembled device presents a different interface such as IEEE-488, parallel port or USB.
English: Diagram illustrating the basic internal parts of a 3.5" floppy disk. Document labels rendered as numbers to aid in internationalization. Note: The unlabeled square in the upper left is the approximate location of the write protection tab.
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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A disk controller is a controller circuit that enables a CPU to communicate with a hard disk, floppy disk or other kind of disk drive. It also provides an interface between the disk drive and the bus connecting it to the rest of the system. [1] [2] Early disk controllers were identified by their storage methods and data encoding.
The IBM Diskette General Information Manual (PDF). Product Reference Literature (Fifth ed.). IBM. August 1979. "RX02 8 inch Floppy Drive Information". David Gesswein "8 inch floppy disks". University of Amsterdam. Archived from the original on July 2, 2016
Animated diagram of Juusyoku Record, with which Nakamatsu claims invention of the floppy disk. Upon the basis of the Juusyoku Record patent issued in 1952, Nakamatsu claims to have invented the first floppy disk [3] well before IBM's floppy disk patent was filed in 1969. [26]