Patent ID: 6163425
Filing Date: 2000-12-19
Classification: G11B

Abstract:
A magnetic reproduction apparatus in which information magnetically recorded on at least one magnetic disk recording medium is read by supplying a sense current to an MR head opposed to the record surface of said recording medium using a current supply means, and then decoded by a signal decoding means, the magnetic disk recording medium having N servo information items to be used to control the position of said MR head residing along one circumference of said disk, comprising:an MR head information judgment means for judging whether or not information to be read out from said recording medium by said MR head is needed; anda current supply control means that when information to be read out by said MR head is needed, allows said current supply means to supply a sense current to said MR head; such that when the timing of reading servo information from said recording medium has come, said current supply control means judges that information to be read out by said MR head is needed;a servo information thinning and sampling means for sampling and reading every M-th servo information item by thinning the N servo information items;a servo information prediction means for predicting current servo information as a substitute for thinned-out servo information on the basis of such information as a previous rotating speed of said disk, the position of said MR head, an output current, and a bias current; anda position control means for controlling the position of said MR head on the basis of the predicted servo information.