Determining instability zones of a laser of a heat-assisted magnetic recording head
First Claim
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1. A method, comprising:
- determining instability zones for ambient temperatures and one or more operational parameters applied to a heat-assisted magnetic recording head that writes to a recording medium, the one or more operational parameters including one or more of a laser input bias current and a laser input boost current, operations within the instability zones resulting in instability in operation of a laser of the recording head;
during operation of the recording head, determining that a current ambient temperature and currently applied values of the one or more operational parameters are at or near one of the instability zones; and
modifying a write operation of the recording head in response thereto.
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Abstract
Stability or instability zones are determined for ambient temperatures and one or more operational parameters applied to a heat-assisted magnetic recording head. Operations within the stability or instability zones resulting in respective stable or unstable operation of a laser of the recording head. During operation of the recording head, it is determining that a current ambient temperature and currently applied values of the one or more operational parameters are at or near one of the instability zones, and a write operation of the recording head is modified in response.
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Citations
19 Claims
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1. A method, comprising:
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determining instability zones for ambient temperatures and one or more operational parameters applied to a heat-assisted magnetic recording head that writes to a recording medium, the one or more operational parameters including one or more of a laser input bias current and a laser input boost current, operations within the instability zones resulting in instability in operation of a laser of the recording head; during operation of the recording head, determining that a current ambient temperature and currently applied values of the one or more operational parameters are at or near one of the instability zones; and modifying a write operation of the recording head in response thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method, comprising:
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determining instability zones for ambient temperatures and one or more operational parameters applied to a heat-assisted magnetic recording head that writes to a recording medium, operations within the instability zones resulting in instability in operation of a laser of the recording head; during operation of the recording head, determining that a current ambient temperature and currently applied values of the one or more operational parameters are outside of the instability zones and further determining that the laser is currently operating unstably; and modifying a boundary of instability zones in response thereto. - View Dependent Claims (11, 12, 13, 14)
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15. A method, comprising:
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determining instability zones for ambient temperatures and one or more operational parameters applied to a heat-assisted magnetic recording head that writes to a recording medium, operations within the instability zones resulting in instability in operation of a laser of the recording head; during operation of the recording head, determining that a current ambient temperature and currently applied values of the one or more operational parameters are inside one of the instability zones and further determining that the laser is currently operating stably; and modifying a boundary of instability zones in response thereto. - View Dependent Claims (16, 17, 18, 19)
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Specification