If the buffer becomes depleted midway during a writing session, the media gets corrupted and unusable. Buffer Underrun Protection refers to the techniques used by optical writing devices to prevent the corruption. The writing is temporarily stopped when the buffer is depleted, and resumed when it is filled again. The gap that results is small enough to be tolerated by CD readers, thus ensuring that the CD is not corrupted. Different manufacturers use different names to refer to this technology—like Powerburn (Sony), Super Link (LG), etc.