i see...

I've come across this information in one personal research I did early this year (on external HDs). The usual technical 3D diagrams accompanied the article and were used to illustrate the new perpendicular hard drive technology. As technical diagrams are supposed to speak 'for themselves', it takes more brain processing power for a non-technical person like me to understand what the diagrams were trying to say.

When Apple announced that the new models of their Mac Book Pro line are to ship with perpendicular HDs, this fun animation came along with it.

So, that's what all the static info I was read about was telling me. I see.
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The original may be viewed at http://www.hitachigst.com/hdd/research/recording_head/pr/PerpendicularAnimation.html and needs Flash player installed.