An optical information recording and reproducing apparatus capable of
recording and reproducing information data accurately with respect to an
optical recording medium. The optical information recording and
reproducing apparatus includes an aberration correction part which
corrects aberration of the optical system. The apparatus determines
whether or not an aberration correction by the aberration correction part
is completed based on the signal level read from the optical recording
medium, while changing a spherical aberration correction amount of the
aberration correction part. The apparatus commences a recording operation
or a reproducing operation of the optical information recording and
reproducing apparatus if it is determined that the aberration correction
was completed.
