The low-level track & sector markers were often fiddled with by some software as part of a copy protection scheme.A 3 + 1⁄ 2-inch floppy disk removed from its housingĪ floppy disk or floppy diskette (casually referred to as a floppy or a diskette) is a type of disk storage composed of a thin and flexible disk of a magnetic storage medium in a square or nearly square plastic enclosure lined with a fabric that removes dust particles from the spinning disk. There is some good information on track formatting of different floppy variants here. A quick format won't find them and therefore the format and/or any write to the disk will fail. If you erase your disk, or part of it, using a magnet, the track sector markers are destroyed. In both cases a blank directory is placed at the head of the disk by the operating system. Usually the sectors are overwritten with zeros, but not necessarily. The process is simply to mark the sectors as empty. On a quick format, the electronics assume that the markers are still there. This takes time as the drive must apply the markers, and check that they are correct. On a full format, a completely blank disk has these markers written. These markers are fixed magnetic sequences that are picked up by the drive electronics so that it knows where the sectors are. A formatted disk contains markers which identify the start of each track and the start of each sector within the track.
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