Patent ID: 7085085

Claim:
A disk driving apparatus comprising: a clock sampling unit which generates a sampling clock by multiplying detection frequency of reference clock patterns formed at a given interval along the circumferential direction on a disk media; a first delay circuit in which a plurality of first delay stages is connected in cascade, and which outputs delay clocks from the first delay stages, respectively, upon receiving the sampling clock; an operational unit which receives addresses which indicate positions in the radial direction on the disk media, obtains recording frequency of the sampling clock corresponding to the reference clock patterns formed in areas corresponding to the addresses by using the received addresses, and obtains the number of stages to be used out of the first delay stages which correspond to one cycle of the obtained recording frequency and are necessary for phase adjustment of the sampling clock; a delay control unit which enables the first delay stages the number of which is equal to the number of stages to be used that has been obtained by the operation unit, and disables the remaining first delay stages; a first clock selection circuit which selects and outputs any one of the delay clocks output from the enabled first delay stages; and a data processing unit which executes at least either one of a regenerating operation to read out data from the disk media and a recording operation to write the data in the disk media in synchronization with the delay clock selected by the clock selection circuit.