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US 12,170,435 B2Granted
Managing laser diode cavity thermal transients in HAMR disk drives
AssigneeWestern Digital Technologies, Inc.
InventorsErhard Schreck, Sukumar Rajauria, Robert Smith
Life of this patent
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Abstract
A data storage device may include one or more disks, an actuator arm assembly comprising one or more magnetic recording heads, a laser diode positioned inside a laser diode cavity, and one or more processing devices configured to initiate a write operation, wherein initiating the write operation comprises activating a magnetic recording head corresponding to the laser diode, and applying a forward bias to the laser diode; apply a first reverse bias to the laser diode during at least one intervening event; and transition from applying the first reverse bias to the at least one laser diode to applying the forward bias to the at least one laser diode.
Claims26
A data storage device, comprising:
- one or more disks;
- an actuator arm assembly comprising one or more magnetic recording heads;
- at least one laser diode corresponding to the one or more magnetic recording heads;
- and
- one or more processing devices configured to:
- initiate a write operation, wherein initiating the write operation comprises:
- activating a magnetic recording head corresponding to the at least one laser diode, and
- applying a forward bias to at the least one laser diode;
- apply a first reverse bias to the at least one laser diode during at least one intervening event, wherein the at least one intervening event comprises an event selected from a group consisting of a track seek event and a servo wedge crossing event;
- and
- transition from applying the first reverse bias to the at least one laser diode to applying the forward bias to the at least one laser diode.
8 more elements
A method of operating a data storage device, the method comprising:
- initiating a write operation, wherein initiating the write operation comprises:
- activating a magnetic recording head corresponding to at least one laser diode of the data storage device, and
- applying a forward bias to the at least one laser diode;
- applying a first reverse bias to the at least one laser diode during at least one intervening event, wherein the at least one intervening event comprises an event selected from a group consisting of a track seek event and a sector ID crossing event;
- and
- transitioning from applying the first reverse bias to the at least one laser diode to applying the forward bias to the at least one laser diode.
3 more elements
One or more processing devices comprising:
- means for initiating a write operation, wherein the means for initiating the write operation comprises:
- means for activating a magnetic recording head corresponding to at least one laser diode of a data storage device, and
- means for applying a forward bias to the at least one laser diode;
- means for applying a first reverse bias to the at least one laser diode during at least one intervening event, wherein the at least one intervening event comprises an event selected from a group consisting of a track seek event and a servo wedge crossing event;
- and
- means for transitioning from applying the first reverse bias to the at least one laser diode to applying the forward bias to the at least one laser diode.
3 more elements
A data storage device, comprising:
- one or more disks;
- an actuator arm assembly comprising one or more magnetic recording heads;
- a laser diode, wherein the laser diode is positioned inside a laser diode cavity;
- and
- one or more processing devices configured to:
- initiate a write operation, wherein initiating the write operation comprises:
- activating a magnetic recording head corresponding to the laser diode, and
- applying a forward bias to the laser diode;
- pause application of the forward bias to the laser diode during an intervening event, wherein the intervening event comprises one of a track seek event and a servo wedge crossing event;
- preheat the laser diode cavity during the intervening event;
- and
- resume application of the forward bias to the laser diode.
9 more elements
A data storage device, comprising:
- one or more disks;
- an actuator arm assembly comprising one or more magnetic recording heads;
- at least one laser diode corresponding to the one or more magnetic recording heads, wherein each of the at least one laser diode is positioned inside a corresponding laser diode cavity;
- and
- one or more processing devices configured to:
- initiate a write operation, wherein initiating the write operation comprises:
- activating a magnetic recording head corresponding to the at least one laser diode, and
- applying a forward bias to at the least one laser diode;
- apply a first reverse bias to the at least one laser diode during at least one intervening event, wherein applying the first reverse bias during the at least one intervening event comprises controlling transition of a preamplifier from applying the forward bias to applying the first reverse bias to the at least one laser diode, and wherein a temperature of a corresponding laser diode cavity is configured to stay the same or substantially the same after controlling the transition from the forward bias to the first reverse bias for the at least one laser diode;
- and
- transition from applying the first reverse bias to the at least one laser diode to applying the forward bias to the at least one laser diode.
8 more elements
Dependencies are inferred from the claim text.