Laser mode hopping detection in a heat-assisted magnetic recording drive
First Claim
Patent Images
1. A method, comprising:
- performing a write operation using a heat-assisted magnetic recording (HAMR) drive operating at a plurality of temperatures;
measuring a metric of write performance subsequent to the write operation at each of the operating temperatures;
detecting one or more laser mode hops using the metrics;
determining a temperature at which each of the detected mode hops occurred; and
storing the temperature for each detected mode hop in a non-volatile memory of the drive.
1 Assignment
0 Petitions
Accused Products
Abstract
A method comprises performing a write operation using a heat-assisted magnetic recording (HAMR) drive operating at a plurality of temperatures. The method involves measuring a metric of write performance subsequent to the write operation at each of the operating temperatures. The method also involves detecting one or more laser mode hops using the metrics, and determining a temperature at which each of the detected mode hops occurred. The method further involves storing the temperature for each detected mode hop in a non-volatile memory of the drive. The method may involve mitigating laser mode hopping, such as by the drive avoiding the stored temperature(s).
-
Citations
20 Claims
-
1. A method, comprising:
-
performing a write operation using a heat-assisted magnetic recording (HAMR) drive operating at a plurality of temperatures; measuring a metric of write performance subsequent to the write operation at each of the operating temperatures; detecting one or more laser mode hops using the metrics; determining a temperature at which each of the detected mode hops occurred; and storing the temperature for each detected mode hop in a non-volatile memory of the drive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
-
-
13. An apparatus, comprising:
-
a heat-assisted magnetic recording (HAMR) drive comprising at least a writer, a laser diode, a reader, a controller, and a non-volatile memory; the controller configured to; perform a write operation at a plurality of temperatures; measure a metric of write performance subsequent to the write operation at each of the operating temperatures; detect one or more laser mode hops using the metrics; determine a temperature at which each of the detected mode hops occurred; and store the temperature for each detected mode hop in the memory. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
-
Specification