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-   -   How Perpendicular Recording Works (http://www.madshrimps.be/vbulletin/f22/how-perpendicular-recording-works-24842/)

TheTarget 26th June 2006 21:09

How Perpendicular Recording Works
 
Data is read and write on magnetic disks thanks to the electromagnetism physics phenomena. In 1820 a physicist called Hans Christian Oersted observed while he was preparing a lab class for his Physics students that an electrical current flowing in a wire moved the needle of a compass located near this wire. When the electrical current was shut down, the compass needle went back showing the location of Earth’s magnetic north pole. With that, he came to the conclusion that all conductors (wires) create a magnetic field around them when an electrical current is flowing. When the direction (polarity) of this electrical current is reversed, so is the polarity of the magnetic field.

GIBSON 27th June 2006 10:33

duno if you've seen this one before, it's been on there for a while but it's pretty funny:
http://www.hitachigst.com/hdd/resear...Animation.html


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