Mitsumi quick disk6/22/2023 A drive which has new bearings and is powered by fresh batteries may be able to spin faster than one with worn bearings powered by substantially depleted batteries. In something like a portable CD player, the maximum speed at which the drive motor can spin may be affected by the strength of the batteries and the amount of friction. Once the drive has done that, it will be able to continuously adjust the drive speed to ensure that data arrives at the proper rate. Provided that the drive is spinning at a rate which is at least some reasonable fraction of correct, a drive will be able to either read data (if the rate is anywhere close to correct, the electronics will adapt to it), identify that pulses are coming in more slowly than could occur if the drive were spinning at the correct speed, or identify that pulses are coming in more quickly than could occur at the correct speed. To accommodate these issues, drives are designed around the assumptions that (1) if they run the head motor towards the hub, they will eventually find part of the disk which has readable information around it, which should always be written at a known speed, and (2) once they have done that, almost any part of the disk they encounter afterward will have readable information written on it. Additionally, while many floppy disk drives use stepper motors so they can move the drive head in and out by known amounts, many CD players and CD-ROM drives merely have a cheap DC motor that moves the head in and out at a speed that might vary +/-30% from nominal, and have no kind of feedback sensor of their own. Other formats may get more or less capacity from the same drives and disks.Unlike some kinds of tape or disk drives, or for that matter analog record players, whose motors are designed to always run at some particular speed, CD players and CD-ROM drives are designed to spin faster when accessing data near the inside of the disk than when accessing data outside. For 5 1⁄ 4- and 3 1⁄ 2-inch: standard PC formats, capacities quoted are the total size of all sectors on the disk and include space used for the bootsector and filesystem.For 8-inch: standard IBM formats as used by the System/370 mainframes and newer systems.Floppy disk formatĪcronyms: DD = Double Density QD = Quad Density HD = High Density ED = Extra-high Density LS = Laser Servo HiFD = High capacity Floppy Diskĭates and capacities marked ? are of unclear origin and need source information other listed capacities refer to: The floppy drive reads the disk (or diskette) and the user is then able to open and change the files saved on the disk.Ĭapacities Historical sequence of floppy disk formats, including the last format to be generally adopted - the "1.44 MB" 3½-inch HD floppy, introduced 1987. A disk, often called a floppy disk, is used to store files and carry them from one computer to another by using the floppy drive. It is the part of a computer that reads and writes the disk that can be removed. The floppy drive Ī floppy drive (often called drives “A” and “B” on a computer running DOS or Windows) can be connected to or installed in a personal computer (PC). Floppy disks and drives are no longer manufactured, but are still widely-available as new old stock. Today, floppy disks have been replaced by other storage media, like USB flash drives. The two most popular were the Zip drive and the Jaz drive, both made by Iomega.įloppy disk technology has been around since the early 1970s (the 8-inch floppy was the first). Larger size floppy disks became available in the 1990s. This is usually enough for simple text documents.Ī special type of floppy disk was made in the late 1980s. A normal 3 1⁄ 2 inch disk can store 1.44 megabytes of data. Floppy disks are inserted in to a floppy disk drive or simply floppy drive to allow data to be read or stored.įloppy disks store much less data than a CD-ROM disk or USB flash drive. Some early digital cameras, electronic music instruments and older computer game consoles use floppy disks. Floppy disks are used for moving information between computers, laptops or other devices. The floppy disk is a removable magnetic storage medium.
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