Patent ID: 6181507
Filing Date: 2001-01-30
Classification: G11B

Abstract:
A method for positioning an access device used to access data on a data storage medium, the data storage medium having a stream of positioning bursts stored thereon, the method comprising:(a) moving the data storage medium relative to a sensing device such that at least some sequential positioning bursts of the stream of positioning bursts move past the sensing device at a first frequency;(b) sensing the at least some sequential positioning bursts with the sensing device; and(c) positioning the access device using a stream of positioning values generated at a second frequency greater than the first frequency, one or more positioning values of the stream of positioning values being calculated as a function of respective bursts of the at least some sequential positioning bursts, wherein said positioning the access device (c) includes, for first and second sensed sequential positioning bursts of the at least some sequential positioning bursts:(i) generating a desired positioning value relative to a present positioning value, the present positioning value determined by the first sequential positioning burst, the desired positioning value determined by the second sequential positioning burst; and(ii) interpolating an intermediate positioning value having an amplitude guaranteed as substantially always between the present positioning value and the desired positioning value, such that the generated stream of positioning values includes the desired positioning value and the intermediate positioning value, wherein the amplitude of the intermediate positioning value guaranteed as substantially always between the present positioning value and the desired positioning value serves to promote avoidance of acoustic noise during said positioning the access device (c).