A standard disk rotates at around 360 revolutions per minute (rev/min), giving a data transfer rate of between 200 and 400 KB per second (KB/s). Modern disks usually have 135 tracks per inch (tpi), giving a data density of 5000 bits per inch (bpi). Within the outer shell of a diskette there’s a non-rigid magnetically-coated disk, usually divided into 80 tracks on each side. The floppy disk controller that’s fitted into older Mac OS machines is known as an Integrated Wozniak Machine or Super Integrated Wozniak Machine (SWIM), a fitting tribute to the inventor.Because of these limitations, diskette drives aren’t fitted inside some modern machines, although an external floppy drive can be connected via a spare USB port. Unfortunately, this kind of medium has inadequate capacity for modern documents and applications, although compatible drives such as the SuperDisk have extended the format for a short time. The 3½ inch micro diskette or floppy disk, as employed in many computers, was originally devised by the Sony Corporation.
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