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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.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
77% of the total text.
Page 1 of 1
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
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...