Industrial Technology Research Institute

Chieh-Chih Li

Carl Y Yang

Jen-Yu Hsu

Chien-Li Hung

A track-number seeking algorithm and a seeking means for the dynamic modification of the computation of track numbers in an optical storage device employs a down counter, an up counter and a microprocessor. First, a rotation number of an optical storage disk in the microprocessor, a track error zero crossing signal of the down counter and the up counter are reset, a static track seeking number of the down counter is set, and a seeking operation is performed. The seeking operation reads the rotation number and the track error zero crossing signal, computes a residual track number, and judges whether an overflow flag is to be sent. If the overflow flag is sent, then, the rotation number is added, a pulse number of a feedback signal is reset, and the next step is to judge whether the seeking operation is outward or not. If the overflow flag is not sent, the next step is to judge directly whether the seeking operation is outward or not. Next, if the seeking operation is outward, and the residual track number is equal to the rotation number, the seeking operation is terminated; otherwise, the seeking operation is repeated. If the seeking operation is inward, and the residual track number is equal to the negative value of the rotation number, the seeking operation is terminated; otherwise, the seeking operation is repeated.

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Chiayi, Taiwan

Chieh-Chih Li