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Intelligent Burnishing System using a Cognizant Burnish Head

IP.com Disclosure Number: IPCOM000040975D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Hopkins, JS: AUTHOR [+3]

Abstract

A system is described which employs real time control of a burnish head to perform the dual functions of asperity detection and burnishing a magnetic storage disk.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 77% of the total text.

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Intelligent Burnishing System using a Cognizant Burnish Head

A system is described which employs real time control of a burnish head to perform the dual functions of asperity detection and burnishing a magnetic storage disk.

The system utilizes a burnish head 1 equipped with a glide height defect sensor system such as an Acoustic Emission (AE) detection system, for example. As the disk 2 is spinning at full RPM, the burnish head acts as a glide head and scans over the surface of disk 2 at high speed. However, as soon as the head 1 detects the presence of an asperity, the scan rate is decreased to a low speed. This is accomplished by the AE detector circuit 3 output to intelligent burnish control circuit 4 which generates a voltage to control the frequency of a voltage controlled oscillator 5 which sets the rate for scan rate control 6.

This action enables the head 1 to act as a burnisher by maximizing the number of scans over the asperity, for removing the asperity or reducing its height. The burnish head 1 continues to monitor the presence or absence of the asperity, with the AE sensor, as it passes over the asperity. At some point, the asperity will no longer be detected either because it has been burnished off or because the burnish head has traveled past the asperity. When the asperity is no longer detected, the scan rate is accelerated back to the high speed. This process is continued until the entire surface has been scanned. Any asperities that remain are...