When a disk stack is serviced by a comb-like access mechanism, there is one read/write head for each

A disk stack is serviced by a comb-like access mechanism, there is one read/write head for each the disk surface. The disk surface is logically divided into tracks, which are subdivided into sectors. A sector (varying from 32 bytes to 4096 bytes, usually 512 bytes) is the smallest unit of information that can be read from or written to disk.