TED-Ed: How do hard drives work?

This is computer hardware 101, but many think that some occult thing is going on inside the hard drives. Nothing short of science, we all can say. The data is stored as a string of bits, 1s and 0s, which are, in fact, small patches of magnetic material magnetized in one way or the other.

The magnetic patches for bits have continually decreased over time and now you can store TBs of data on a platter as opposed to the 5MB on a half of ton hard drive IBM first invented.

The way the manufacturers have increased the number of bits on a platter is also closely related to the usage of smaller read/write heads which are also way closer to the platters. On some high end hard drives a laser is also used to help in writing data on the disk. Technology is awesome 😀

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