| 摘要 |
A servo disc in a magnetic disc drive has pulses recorded in frames in concentric data tracks. Each frame includes first and second sync pulse groups of at least one sync pulse each, a first track alignment signal (Quad) following the first sync group, and a second track alignment signal (Sig) following the second sync group. A Guard Band and a data Track Zero are identified by eliminating one sync pulse in selected members of frames. Circuitry including monostable multivibrator, flip-flops, and gates identify the Guard Band and Track Zero. |
