In an optical disk reproducing device capable of rotating an optical disk
at a selected one of a plurality of preset linear velocities, vibrations
or shock of the device is detected during rotation of the disk, and the
linear velocity of the disk is determined based on the result of the
detection of the vibration or shock to restrain the vibration and shock
within a permissible range. A limit rotational velocity above which the
vibration or shock is excessive may be determined during a test conducted
each time a disk is inserted, and the linear velocity of the disk during
reproduction may be determined such that the rotational velocity does not
exceed the limit rotational velocity.