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| Historically, achieving higher areal densities
required the read/write heads to fly progressively closer to
the disk surface, based on physical spacing laws. This allows
the fields created during the write process, and subsequently
read, to be focused into a smaller space as areal density increases.
Today's Hitachi GST disk drives have flying heights as low as
10 nm and expectations are that a 8 nm physical spacing between
head and disk surface could be attained not long after 2003.
The trend does indicate a slowing somewhat of the spacing decrease
trend with areal density which probably reflects the slowing
of linear density growth rate in favor of track density as previously
indicated. However, continued spacing decrease requires a disk
surface exhibiting a maximum in perfection, planarity essentially
to be defect-free. |
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