As the brakes are applied, the pads slide over the varying disc surface.

These variations in the disc surface are usually the result of extensive vehicle road usage.

By varying the radius of the contact point between the two disc surfaces, different gears can be achieved.

'You don't expect me to get us into interspace from the disc surface?'

One phase of the motor is produced by a coil with many turns located above the disc surface.

Head crashes were common, because the head flew less than a human hair's width above the disc surface.

The tangential needle speed relative to the disc surface is approximately one mile per hour, on average.

A burst cutting area is located at the inner ring of the disc surface.

Minute denticles are also present on the remainder of the disc upper surface.

As the reaction progresses, the disc surface changes its color and after a predetermined time it becomes unreadable.