The head, positioned beneath the diskette in a single-sided drive, reads data from a zone approximately 20 mm wide. 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.
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