How is a hard drive magnetized?

U

Username2016-03-13 22:38:33

Physics

Username, 2016-03-13 22:38:33

I am interested in the following moment, we create a magnetic field as a result of which the ferromagnet is magnetized and receives + or -. What is included in the concept of plus and minus (this is the direction of rotation of the electron)?
And how does the head set the magnetization, i.e., does the head differ during magnetization in plus and minus?

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Maronus, 2016-03-14
@Maronus

The wiki describes everything very well: both about +/- and about the operation of the head.