Cylinder-head-sector, also known as CHS, was an early method for giving addresses to each physical block of data on a hard disk drive. In the case of floppy drives, for which the same exact diskette medium can be truly low-level formatted to different capacities, this is still true. Though CHS values no longer have a direct physical relationship to the data stored on disks, pseudo CHS values are still being used by many utility programs.

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