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US 10,997,997 B1Granted
Data storage device compensating for mode hop of a laser
AssigneeWestern Digital Technologies, Inc.
InventorShaomin Xiong
Life of this patent
Estimating the term…
Abstract
A data storage device is disclosed comprising a head actuated over a recording medium, wherein the head comprises a laser configured to heat the recording medium. A mode hop map is generated for a write power applied to the laser during a write operation. The write power is applied to the laser during the write operation and the write power is adjusted in response to the mode hop map.
Claims18
A data storage device comprising:
- a recording medium;
- a head actuated over the recording medium, wherein the head comprises a laser configured to heat the recording medium;
- and
- control circuitry configured to:
- generate a mode hop map for a write power applied to the laser for a write operation by:
- applying the write power to the laser during a first test write;
- detecting a first mode hop of the laser during the first test write;
- generating a first compensation for the detected first mode hop;
- applying the write power to the laser during a second test write;
- adjusting the write power using the first compensation to compensate for the first mode hop during the second test write;
- and
- after compensating for the first mode hop, detecting a second mode hop of the laser during the second test write;
- and
- generating a second compensation for the detected second mode hop;
- and
- apply the write power to the laser during the write operation and adjust the write power in response to the mode hop map.
13 more elements
A data storage device comprising:
- a recording medium;
- a head actuated over the recording medium, wherein the head comprises a laser configured to heat the recording medium;
- and
- control circuitry configured to:
- apply a write power to the laser during a first test write;
- detect a first mode hop of the laser during the first test write;
- generate a first compensation for the detected first mode hop by:
- applying the write power to the laser during a second test write;
- adjusting the write power using the first compensation to compensate for the first mode hop during the second test write;
- measuring an efficacy of the first compensation to compensate for the first mode hop;
- and
- adjusting the first compensation based on the measured efficacy;
- and
- apply the write power to the laser during a write operation and adjust the write power in response to the first compensation to compensate for the first mode hop.
11 more elements
A data storage device comprising:
- a recording medium;
- a head actuated over the recording medium, wherein the head comprises a laser configured to heat the recording medium;
- and
- control circuitry configured to:
- apply a write power to the laser while burst writing first test data to the recording medium at a first temperature;
- read the first test data from the recording medium to generate a first read signal;
- measure a first written-in amplitude of the first read signal;
- apply the write power to the laser while burst writing second test data to the recording medium at a second temperature;
- read the second test data from the recording medium to generate a second read signal;
- measure a second written-in amplitude of the second read signal;
- and
- detect a mode hop of the laser based on the first and second written-in amplitude measurements.
9 more elements
A data storage device comprising:
- a recording medium;
- a head actuated over the recording medium, wherein the head comprises a laser configured to heat the recording medium;
- and
- control circuitry configured to:
- apply a write power to the laser during a first test write;
- detect a first mode hop of the laser during the first test write;
- generate a plurality of compensations for the detected first mode hop, wherein each compensation corresponds to a different operating temperature of the data storage device;
- measure the operating temperature of the data storage device;
- select the compensation corresponding to the measured operating temperature;
- and
- apply the write power to the laser during the write operation and adjust the write power in response to the selected compensation,
- wherein the operating temperature of the data storage device causes a change in the mode hop of the laser.
9 more elements
Dependencies are inferred from the claim text.