For simplifying the control circuitry, the same number of bits are stored on each track. Thus the density, in bits per linear inch, increases in moving from the outermost track to the innermost track.
Data are transferred to and from the disk in blocks. Usually, the block is smaller than the capacity of the track. Accordingly, data are stored in block-size regions known as sector.
A typical disk layout is shown in the Figure 7.6.
To avoid, imposition unreasonable precision requirements on the system, adjacent tracks (sectors) are separated by intratrack (intersector) gaps.
