A new lubrication for high-density magnetic-coated disk

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Abstract
We have developed a new lubrication method to assure sufficient mechanical durability, which enabled us to produce low-noise, error-free magnetic-coated disks having a density as high as 30 000 FRPI. Improvement of SNR at high density requires reduction of alumina particles (the film hardening agent), and so the lubrication method is of great importance. So we first investigated the relationships between the film properties, head-to-disk adhesion, and the CSS (Contact Start & Stop) durability, and found that it was essential that the lubricant be absorbed into the film. For this purpose, we finally discovered a novel lubrication method, which is to put hydrophilic resin having an ether-bonded side chain as a component of the coating binder. By this method, the amount of absorbed lubricant increases with the resin content thus greatly improving durability. The resultant disk with a film thickness of 0.4 μm shows a durability of more than 100 000-CSS cycles, extremely low noise of 6 μV rms, and good bit-error characteristics at a density of 30 000 FRPI.

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