Data storage device using single-layer multi-level magnetic recording
AssigneeWestern Digital Technologies, Inc.
InventorAaron K. Mohl
Life of this patent
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Abstract
A data storage device is disclosed comprising a disk surface comprising a magnetic recording layer comprising a first magnetic material having a first coercivity intermixed with a second magnet material having a second coercivity higher than the first coercivity, and a head comprising a write coil configured to magnetize the magnetic recording layer in order to write data to the disk surface. The data is written to the disk surface by configuring the magnetic recording layer into one of at least three recording states, and the data is read from the disk surface by reading the magnetic recording layer using the head to generate a multi-level read signal, where each level of the read signal corresponds to one of the recording states.
Claims21
A data storage device comprising:
- a disk surface comprising a magnetic recording layer comprising a first magnetic material having a first coercivity intermixed with a second magnet material having a second coercivity higher than the first coercivity;
- a head comprising a write coil configured to magnetize the magnetic recording layer in order to write data to the disk surface;
- and
- control circuitry configured to:
- write the data to the disk surface by configuring the magnetic recording layer into one of at least three recording states;
- read the data from the disk surface by reading the magnetic recording layer using the head to generate a multi-level read signal, where each level of the read signal corresponds to one of the recording states;
- and
- detect the data from the multi-level read signal using an adjustable detector configured to account for a deviation in a ratio of the magnetic materials from a target ratio.
A data storage device comprising:
- a disk surface comprising a magnetic recording layer;
- a head comprising a write coil and an energy assist element configured to generate an energy assist during write operations;
- and
- control circuitry configured to:
- write data to the disk surface by configuring the magnetic recording layer into one of at least a first recording state, a second recording state, or a third recording state;
- apply a non-zero energy assist to the magnetic recording layer and apply a non-zero write current to the write coil to configure the magnetic recording layer into the first recording state or the second recording state;
- and
- apply the non-zero energy assist to the magnetic recording layer and apply a zero write current to the write coil to configure the magnetic recording layer into the third recording state.
A data storage device comprising:
- a disk surface comprising a magnetic recording layer comprising a first magnetic material having a first coercivity intermixed with a second magnet material having a second coercivity higher than the first coercivity;
- a means for writing data to the disk surface by configuring the magnetic recording layer into one of at least three recording states;
- a means for reading the data from the disk surface by reading the magnetic recording layer to generate a multi-level read signal, where each level of the read signal corresponds to one of the recording states;
- and
- a means for detecting the data from the multi-level read signal by accounting for a deviation in a ratio of the magnetic materials from a target ratio.
Dependencies are inferred from the claim text.