Noun
cylinder-head-sector (uncountable)
(computing) An addressing system of hard drives where the hard drive is addressed by its cylinders, heads, and sectors.
Some modern SATA drives also report cylinder-head-sector (CHS) capacities, but these are not physical parameters because the reported values are constrained by historic operating system interfaces. Source: Internet
The basic problem is turning the file block address into a disk block (or perhaps to a cylinder-head-sector ) address. Source: Internet