Magnetic recording medium
AssigneeThe Regents of the University of California
InventorsAlexander Krichevsky, Sakhrat Khizroev, Ilya Isaakovich Dumer, Andrey Alekseyevich Lavrenov, Nissim Amos
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Abstract
A novel magnetic recording medium is disclosed in which a plurality of magnetic data recording layers and navigation layers are separate from one another. By decoupling the navigation and data layers, data may be written to data layers without the need to align the written data along servo tracks. Thus, the data layers may be configured for high recording density. Beneficially, imperfections within the magnetic data layers may also be compensated for by the use of adaptive error correction schemes which vary the encoding/decoding of data during writing/reading based upon the local quality of the recording media.
Claims36
A magnetic recording medium, comprising:
- a first recording layer to which a first data may be magnetically recorded;
- a second recording layer to which a second data may be magnetically recorded, wherein the first recording layer is positioned beneath the second recording layer and wherein a magnetic coercivity of the second recording layer is greater than the first recording layer;
- and wherein the first data comprises navigation information for identifying a location of the second data within the second recording layer.
A magnetic recording system comprising:
- a data layer to which first data may be magnetically recorded;
- a navigation layer to which navigation data may be magnetically recorded, wherein a magnetic coercivity of the data layer is greater than the navigation layer and wherein the navigation data identifies the location of the first data within the data layer;
- and
- a plurality of read/write poles within a single head, capable of separately reading and writing data to the data and navigation layers.
A method of recording data to a magnetic recording medium, comprising:
- selecting a portion of data layer of the magnetic recording medium to which data is to be recorded;
- writing predetermined data to the data layer using selected write parameters;
- determining a strength of the magnetic field of the data written to the data layer using the selected write parameters;
- comparing the measured magnetic field strength to a threshold value;
- determining an encoding scheme based upon the strength of the measured magnetic field when the measured magnetic field strength is greater than or equal to the threshold value;
- and
- writing the write parameters and determined encoding scheme for the selected portion of the data layer to a navigation layer of the magnetic recording medium;
- wherein the data and navigation layers of the magnetic recording medium are configured as separate layers of the magnetic recording medium.
A method of fabricating a magnetic recording medium, comprising:
- providing a substrate;
- depositing a first magnetic layer over the substrate to which first data may be magnetically written and read;
- and
- depositing a second magnetic layer over the first magnetic layer to which second data may be magnetically written and read;
- wherein the magnetic coercivity of the second magnetic layer is greater than that of the first magnetic layer and wherein the first data comprises navigation information for identifying a location of the second data within the second recording layer.
A magnetic recording device for reading and writing data magnetically to a magnetic recording medium, comprising:
- a reading and writing head, comprising:
- a first magnetic pole;
- and
- a second magnetic pole;
- wherein the width of the second magnetic pole is less than the width of the first magnetic pole and wherein the second magnetic pole is configured to generate a maximum magnetic field strength which is greater than that of the first magnetic pole.
Dependencies are inferred from the claim text.