Head position control for a disk drive which performs recording about the rotational center even if the recorded servo information is eccentric
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United States of America Patent
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Oct 3, 2000
Grant Date -
N/A
app pub date -
Feb 24, 1997
filing date -
Jun 10, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
Head position control is implemented in a disk drive for the case in which a disk is assembled into the disk drive after a precise track is recorded onto it using an external apparatus, which is capable of high-speed access even if there is eccentricity between a track defined by servo information and the center of rotation of the track. Two phase servo bursts consisting of servo information are recorded onto each of the servo information regions of a disk surface, in mutual alternation, the strength ratio between signals detected from these two phase servo bursts being used to determine to which side the head is displaced. By performing control so that this strength ratio is a prescribed value at each angular position, control is achieved so that the head moves along a circular path of rotation, even if there is eccentricity in the servo circular path defined by the recorded servo information with respect to the center of rotation.
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