Patent ID: 7529161
Filing Date: 2009-05-05
Classification: G11B

Abstract:
1. An information reproduction method in which information from an information storage medium on which land and groove tracks which can record information are alternately formed in a radial direction along wobbles that represent address information, information reproduction method comprising: determining a track structure of a current position traced by a light beam based on the address information imparted to reflected light obtained from the information storage medium, and a track structure of a target position based on a target position address included in a seek command; controlling access to the address of the target position by switching between a first servo polarity corresponding to a land track and a second servo polarity corresponding to a groove track at a predetermined timing as needed based on a determination result of the two track structures; and reproducing predetermined information imparted to the reflected light obtained from an area corresponding to the address of the target position, wherein when a condition of the servo polarity in a seek operation on the information storage medium is limited to the first servo polarity, access to the address of the target position on a groove track is controlled by executing a seek operation by the first servo polarity corresponding to a land track of the current position to access a land track that neighbors the groove track of the target position on the basis of the determination result indicating that the track structure of the current position is a land track and the track structure of the target position is a groove track, acquiring address information imparted to wobbles along the land track, and switching the first servo polarity to the second servo polarity.