According to experts, is a magnetic hard disk storage, and its working principle is to use the metal film coating the surface of the disk of the polar magnetic particles to record data.

• 据专家们介绍，硬盘是一种磁性存储器，其工作原理是利用涂敷在金属薄膜磁盘表面的磁粒子的极性来记录数据。