An error detected by reading of a binary character not previously recorded, in storing, or retrieving data from a magnetic storage device.Note: Drop-ins are usually caused by defects in or the presence of particles on the magnetic surface layer.

• 在磁性存储设备中存储数据或从中检索数据的过程中，由于读到以前未曾记录过的一个二进制字符而检测出来的一种错误。注：引起这种混杂信息的原因通常是在磁表面层中有缺陷或在其表面上存在微粒杂物。