| 摘要 |
Detection of a wobble cycle of wobble formed at a groove of an optical disc is started. A phase locked loop time that is from reset of phase locked loop circuit until a signal read from the wobble locks is calculated. The focus balance value corresponding to the minimum phase locked loop lock time is set as the focus balance value for ADdress In Pre-groove. When ADdress In Pre-groove information being address information is read, focusing servo control is performed with the focus balance value for ADdress In Pre-groove.
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