Data reading mechanism for disk apparatuses for reproducing data and serum information recorded on a recording medium by a multi-zone recording method

摘要

Each track on a recording medium 1 is divided into a plurality of sectors, each of which comprises a head positioning information area and a data area. Signals read out of the recording medium 1 undergo wave shaping by a low-pass filter 4 and a differentiating circuit 5. An index pulse generator 8 generates an index pulse indicating the reference position of each track on the basis of an index hole detected by a detector 7. A control circuit 20, on the basis of the index pulse, generates a control signal for distinguishing the head positioning information area and the data area from each other. The low-pass filter 4 and the differentiating circuit 5, each in accordance with a control signal, switch between their two frequency characteristics.