1/3/2024 0 Comments Mitsumi quick disk transportIn 1967, IBM tasked their San Jose, California storage development center to develop a reliable and inexpensive system for loading microcode into their System/370 mainframes in a process called Initial Control Program Load (ICPL). While floppy disk drives still have some limited uses, especially with legacy industrial computer equipment, they have been superseded by data storage methods with much greater capacity such as USB flash drives, portable external hard disk drives, optical discs, memory cards, and computer networks.ĭrawings from IBM Floppy Disk Drive Patents Sizes ranged from 8 inches in the first commercialized floppy disk to the 3½-inch floppy disks still available today.įloppy disks slowly lost popularity as better technology developed which was able to offer higher levels of storage capacity, smaller physical characteristics, and faster processing speeds. Throughout the period in which floppy disks were common, they went through numerous improvements, each time significantly improving their available storage capacity and reducing their physical size as computer data storage technology advanced. Floppy disks remained a popular portable digital-storage medium for nearly 40 years after being introduced commercially in 1971. The floppy disk was a revolution in the computer industry when it was developed by IBM in the late 1960s as a reliable and inexpensive method of loading microcode into their System/370 computer. The Quick Disk (QD) was a 3-inch floppy disk design launched by Mitsumi around 1985 (a prototype was shown in 1984).8-inch, 5¼-inch, and 3½-inch floppy disksĪ floppy disk is a disk storage medium composed of a disk of thin and flexible magnetic storage medium, readable by a floppy disk drive (FDD), and sealed in a rectangular plastic carrier lined with fabric which serves the purpose of keeping the data storage disk free of foreign particles such as dust. Drive belt replacement for MITSUMI D357B Floppy Disc Driveįloppy drives from the late 1980s and early 1990s often used belt drives to connect the drive motor (top right corner) to the floppy disk itself (middle left - large black plastic flywheel). It was a much simpler design than other floppy disks of the time as it had no shutter mechanism to protect the disk surface from dust and used break-off tabs (rather than a sliding tab) for write-protection. The synthetic rubber belt which connects the motor to the disk flywheel tends to go either loose (as in this case), or to dissolve into a sticky goo. Un disco flexible o también disquete (en inglés floppy disk), es un tipo de dispositivo de almacenamiento de datos formado por una pieza circular de material magnetico que permite la grabación y lectura de datos, fino y flexible (de ahí su denominación) encerrado en una carcasa fina cuadrada o rectangular de plástico. The 'plasticisers' used to make things soft and springy have a limited life-time (evaporation of volatile compounds, effect of UV light, etc) and so drive belts either go loose or brittle - SY99 drive belts seem to go loose or even dissolve. The SY99 shown here is from 1991, and so was about 13 years old in 2004. You can get replacement belts with the correct dimensions and tension from: The drive belt was so loose that the motor no longer turned the plastic fly wheel, and so the drive did not work. 'windchest' on ebay sometimes has them.
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