Apparatus for evaluating magnetic recording medium

Details Apparatus for evaluating magnetic recording medium Apparatus for evaluating magnetic recording medium

1996-08-13

1998-10-20

Raevis, Robert

Measuring and testing

Inspecting

G11B 560

Patent

active

058249206

ABSTRACT:
A method of obtaining a limit glide height in flying a head above a recording medium being rotated. The first step is storing the medium and the head into a chamber, stepwise reducing an air pressure in the chamber, and measuring a flying height of the head and a frequency of contact of the head with the medium in each step. The second step is performing head vanish to polish away projections on the medium by means of the head under such conditions that the head at least intermittently comes into contact with the medium. The third step is reproducing the air pressure in each step in the first step, and again measuring a flying height of the head and a frequency of contact of the head with the medium in each step. The final step is comparing a measured value of the frequency of contact in each step in the first step and a measured value of the frequency of contact in each step in the third step, and obtaining the limit glide height defined as a flying height of the head corresponding to the step in which a rate of change in the frequency of contact becomes largest.

REFERENCES:
patent: 5673156 (1997-09-01), Chen et al.

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