A device that reads, writes, or erases data on a storage medium, for example, a small electromagnet used to read, write, or erase data on a magnetic drum or magnetic tape.

• 在存储媒体上进行读、写或擦除数据的一种部件，例如，用于在磁鼓、磁带上读、写或擦除数据的小型电磁体。