The path or one of the set of paths, parallel to the reference edge on a data medium, associated with a single reading or writing component as the data medium moves past the component.

• 与数据媒体基准边并行的轨道或一组轨道中的一条，当数据媒体移动而经过单个读(或写)元件时，就与这种读(或写)元件相联系。