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| The decrease in physical spacing necessary
to achieve increased areal density has required new disk surface
technologies as well as mechanical improvements in head loading.
Because of these low physical spacings, today's disk surfaces
are very smooth, with minimal texturing to reduce stiction.
Hitachi GST first employed a ramp load/unload technique on mobile
disk drives in the post 1998 era, and today is using this technique
on other products. Ramp load/unload allows a reduced amount
of texturing while protecting against stiction, and also provides
addition resistance to non operating shock. Based on prior product
trends and lab demonstrations, physical spacings below 10 nm
are a reality and lower spacings are expected with a gradual
leveling of this trend. |
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