Method and implementation of in-situ absolute head medium...

Details Method and implementation of in-situ absolute head medium... Method and implementation of in-situ absolute head medium...

2006-03-21

2006-03-21

Hudspeth, David (Department: 2651)

Dynamic magnetic information storage or retrieval

Monitoring or testing the progress of recording

C360S075000

Reexamination Certificate

active

07016131

ABSTRACT:
In a method based on readback signal for in-situ measuring of absolute head-medium spacing, a pre-encoded pattern in the magnetic medium on a disk has at least two harmonics with amplitudes such that a linear function of the logarithmic ratio of the spacing loss-term is formed in relation to testing frequencies. This linear function is applied to determine the absolute head-medium spacing directly through the multiplication of gradient of the linear function and the linear velocity between the head and the medium of the disk drive.

REFERENCES:
patent: 4777544 (1988-10-01), Brown et al.
patent: 6384994 (2002-05-01), Smith et al.
patent: 6384995 (2002-05-01), Smith
patent: 2004/0032681 (2004-02-01), Smith et al.

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