Title :
Drive-level flying height measurements and altitude effects
Author :
Deng, Youping ; Tsai, Hsiao-chu ; Nixon, Brian J.
Author_Institution :
Quantum Corp., Milpitas, CA, USA
fDate :
11/1/1994 12:00:00 AM
Abstract :
An electrical method was developed to measure the flying height in a sealed drive. In this method, component-level measurements were first performed on a PPL interferometer and a Guzik tester. Good correlation was found between the flying height and the pulse width (PW50). Within the range of interest, the PW50 was a linear function of the flying height. Thus, the flying height in the drive was obtained by measuring the PW50. This method was used to study the variation in the flying height due to the reduction in air pressure. Changes in recording properties such as signal amplitude, SNR and O/W with the altitude change were also studied
Keywords :
height measurement; magnetic heads; Guzik tester; PPL interferometer; PW50; SNR; air pressure; altitude effects; component-level measurements; drive-level measurements; electrical method; flying height; overwrite; pulse width; recording properties; sealed drive; signal amplitude; Electric variables measurement; Level measurement; Magnetic heads; Optical recording; Performance evaluation; Pressure measurement; Pulse measurements; Space vector pulse width modulation; Testing; Velocity measurement;
Journal_Title :
Magnetics, IEEE Transactions on
