sentences:  As with many (now legacy) original PC specifications, the terminology stuck and the first 63 sectors of modern hard disks are still referred to as Track0.Track0 is physically located on the outer edge of the disk platter.Track0 is also the name of a terminate-and-stay-resident MS-DOS program that allows users to revive floppy disks with defective first tracks by swapping it with another track under the hood.