Dynamic magnetic information storage or retrieval – General processing of a digital signal – Data in specific format
Reexamination Certificate
2005-03-29
2005-03-29
Hudspeth, David (Department: 2651)
Dynamic magnetic information storage or retrieval
General processing of a digital signal
Data in specific format
C360S077120
Reexamination Certificate
active
06873482
ABSTRACT:
A magnetic recording system containing magnetic recording media with separate data and servo magnetic layers is disclosed. A servo magnetic layer resides usually below the data layer and has higher coercivity than that of the data layer. Interference between the data and servo signals is minimized by recording the servo patterns perpendicular or transverse direction with respect to the orientation of data bits. In addition, servo patterns are selected so that no interference with the data is generated by the servo pattern when the reader is in the middle of data tracks. Tracking error signals are approximately linear with track misregistration around the middle of data tracks. Finally, interference between the data and servo signals is further reduced by electronic processing. Continuous servo signals permit increased track densities with a single actuator and very high track densities with dual microactuator-actuator system.
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Hsieh Yung-Chieh
Novotny Vlad
Behiel Arthur J.
Hudspeth David
Kapadia Varsha A.
Silicon Edge Law Group LLP
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