The following quote is from page 4-27 of the MSCP Basic Disk Functions Manual which is part of the UDA50 Programmers Doc Kit manuals: 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.
