Disclosed is a method and apparatus for controlling the record and
reproduction of optical record medium in which plural non-record regions
having different phase are arranged between recordable data regions for
the distinction in the shape of the data region. The method and apparatus
performs the servo using focus error signal and tracking error signal
averaged by the low pass filter at the header region of the optical disc.
Especially, the tracking servo is performed by holding a fixed DC off-set
value at the header region existing on the L/G switching or holding the
tracking error value of the previous same track region. As a result, the
exact header region is detected, the track sliding phenomenon is removed,
and the tracking servo is stabilized, resulting in preventing the
degeneration of the record and reproduction characteristics.