In magnetic disk recording,a technique in which magnetic material defects are identified during the manufacturing stage and their size and location are written on a defect map track on the disk.

• 在磁盘录制中采用的一种技术，该技术在制造过程中能识别磁介质缺陷及其面积的大小和位置，并标记在磁盘的损伤映象磁道上。