magnetic read write head 磁读写头
magnetic read-write head 磁读写头
magnetic read write compatible head 读写兼用磁头
magnetic write head
磁头
以上为机器翻译结果，长、整句建议使用 人工翻译 。
One challenge would involve creating a magnetic head that could hover over those dots, read their signal and write new data onto the grid.
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