Optical disc drive, method of moving beam spot and computer-executable program implementable by the optical disc drive

An optical disc drive for gaining access to a target location on an optical disc, the optical disc including multiple information storage layers, which are stacked one upon the other and each of which includes a track thereon, the optical disc drive comprising:

• a light source for emitting a light beam toward the optical disc;
• a lens for converging the light beam that has been emitted from the light source and forming a beam spot of the light beam on a selected one of the multiple information storage layers;
• a beam spot controller for jumping the beam spot from a first one of the information storage layers to a second one of the information storage layers by controlling the position of the lens;
• and
• a spherical aberration corrector for adjusting the focusing state of the beam spot by changing the spherical aberration of the lens,
• wherein the spherical aberration corrector holds a first spherical aberration associated with the first information storage layer, and then corrects the first spherical aberration into a second spherical aberration, associated with the second information storage layer, after the beam spot controller has jumped the beam spot over to the second information storage layer.