A status signal which is generated whenever a hole is sensed in the disk. In a soft-sectored disk, this will be an index hole ; in a hard-sectored disk, it will be a sectored hole.

• 一种状态信号,每当在磁盘中检测出一个孔时,就产生这个状态信号。在软扇区磁盘中,这应是一个指示(索引)孔;在硬扇区磁盘中,这应是一个扇区孔。