在光记录技术中，指光道上两个凹槽之间的区域。在制作母盘时记录激光束不照射这些区域。参阅pit。 In optical recording, refers to the areas of the data tracks which are between the pits. These are typically the areas not touched by the recording laser beam during mastering.
（磁）记录技术中，用于修饰或说明非法复制的材料。比较copyright。 In recording, pertaining to illegally produced material.
