![]() ![]() The magnets in a hard disk are organized in concentric circles - as many as 250,000 rings on a 3.5-inch platter. The read/write head moves like a record tone arm, and can flip the polarity of the magnet when it’s writing data, or read the polarity when it’s reading data. ![]() The polarity of each magnet can be “up” or “down,” which indicates whether the bit is a 1 or a 0. While the disk platter looks like a mirror, it’s actually composed of up to trillions of tiny magnets standing on end, arrayed in concentric circles. Figure 1 The inside of a hard disc drive, showing the disk platter and the read/write head.
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