As stated above, the host area of a disk is structured as a vector
of logical blocks. From a performance viewpoint, however, it is more
appropriate to view the host area as a four dimensional hyper-cube,
the four dimensions being cylinder, group, track, and sector. . .
Referring to our hyper-cube analogy, the set of potentially accessible
blocks form a line parallel to the track axis. This line moves parallel
to the sector axis, wrapping around when it reaches the edge of the
hyper-cube.
-- MSCP Basic Disk Functions Manual
-- UDA50 Programmers Doc Kit manuals, page 4-27.
