Of interest is not so much 20TB (which is neat in and of itself!) -- but rather the nature of the recording head, where electrical current is introduced down pa

Of interest is not so much 20TB (which is neat in and of itself!) -- but rather the nature of the recording head, where electrical current is introduced down part of it, in addition to the magnetic field. Also of interest is the space gaps between various parts of the recording head, how all of this is related to removing magnetic "jitter" in the write process (because the magnetic field is toggled on and off many millions of times per second; that is, it is resonated at a high frequency (otherwise high bpi's on the recording medium would not be possible)). And of course, this leads to questions (again, think tiny space gap) -- such as "is this effect related to electrical capacitors in any way?", which, if so, leads to questions like "is there such a thing as magnetic capacitance?" In theory all magnets are "magnetic capacitors", to one way of thinking, but is there something else going on here, in the hard drive head, with respect to specific types of field and field interactions -- that is being missed?