DVD hardware accesses the additional layer (layer 1) by refocusing the laser through an otherwise normally-placed, semitransparent first layer (layer 0). This laser refocus—and the subsequent time needed to reacquire laser tracking—can cause a noticeable pause in A/V playback on earlier DVD players, the length of which varies between hardware. Studios began printing a standard message on keep cases explaining that this pause is not an indication of a damaged or defective disc. More recent DVD players combat this issue by using a larger data buffer.