Mobile device and disk drive having a seek current profile responsive to an environment signal
First Claim
1. A method of performing a seek operation in a disk drive connectable to a mobile device that operates in a mobile environment using battery power and that operates in a docked environment using an external source of power, the disk drive having a spindle motor that rotates a storage media at an operating angular velocity, the disk drive operating with a servo system that includes a head actuator drive circuit that applies a current to a head actuator to cause the head actuator to move a head to a track of the storage media and to maintain a position of the head over a selected track of the storage media, the mobile device providing a command to the disk drive to cause the servo system to perform the seek operation to the selected track, the method comprising the steps of:
- receiving an environment signal from the mobile device that indicates whether the mobile device is operating in the docked environment or the mobile environment;
rotating the storage media at a same nominal operating angular velocity in the mobile environment and in the docked environment; and
responding to the environment signal and to the command from the host processor to perform one of;
applying a first set of digital values to the head actuator drive circuit to apply a first current profile to the head actuator to cause the head actuator to move the head to the selected track with a first velocity profile when the environment signal indicates that the mobile device is in the docked environment; and
applying a second set of digital values to the head actuator drive circuit to apply a second current profile to cause the head actuator to move the head to the selected track with a second velocity profile when the environment signal indicates that the mobile device is in the mobile environment.
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Accused Products
Abstract
A servo system in a disk drive in a mobile device is responsive to an environment signal from the mobile device to generate a first current profile to a head actuator when the mobile device is docked and to generate a second current profile to the head actuator when the mobile device is mobile. The second current profile requires less power than the first current profile, thus reducing current drain on a battery in the mobile device.
77 Citations
21 Claims
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1. A method of performing a seek operation in a disk drive connectable to a mobile device that operates in a mobile environment using battery power and that operates in a docked environment using an external source of power, the disk drive having a spindle motor that rotates a storage media at an operating angular velocity, the disk drive operating with a servo system that includes a head actuator drive circuit that applies a current to a head actuator to cause the head actuator to move a head to a track of the storage media and to maintain a position of the head over a selected track of the storage media, the mobile device providing a command to the disk drive to cause the servo system to perform the seek operation to the selected track, the method comprising the steps of:
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receiving an environment signal from the mobile device that indicates whether the mobile device is operating in the docked environment or the mobile environment;
rotating the storage media at a same nominal operating angular velocity in the mobile environment and in the docked environment; and
responding to the environment signal and to the command from the host processor to perform one of;
applying a first set of digital values to the head actuator drive circuit to apply a first current profile to the head actuator to cause the head actuator to move the head to the selected track with a first velocity profile when the environment signal indicates that the mobile device is in the docked environment; and
applying a second set of digital values to the head actuator drive circuit to apply a second current profile to cause the head actuator to move the head to the selected track with a second velocity profile when the environment signal indicates that the mobile device is in the mobile environment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A mobile device comprising a disk drive and a servo system, the disk drive having a spindle motor that rotates a storage media at an operating angular velocity, wherein the mobile device operates in a mobile environment using battery power and operates in a docked environment using an external source of power, the servo system having a head actuator drive circuit that applies a current to a head actuator to cause the head actuator to move a head to a selected track of the storage media, the mobile device comprising:
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an input terminal that receives an environment signal that indicates whether the mobile device is operating in the docked environment or in the mobile environment;
a spindle motor controller that rotates the storage media at a same nominal operating angular velocity in the mobile environment and in the docked environment; and
a servo controller responsive to the environment signal and to a command from the mobile device to;
apply a first set of digital values to the head actuator drive circuit to apply a first current profile to the head actuator to cause the head actuator to move the head to the selected track with a first velocity profile when the environment signal indicates that the mobile device is in the docked environment; and
apply a second set of digital values to the head actuator drive circuit to apply a second current profile to the head actuator to cause the head actuator to move the head to the selected track with a second velocity profile when the environment signal indicates that the mobile device is in the mobile environment. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A mobile device comprising a disk drive and a servo system, wherein the mobile device operates in a mobile environment using battery power and operates in a docked environment using an external source of power, the disk drive including a spindle motor for rotating a storage media at an operating angular velocity, the servo system controlling the movement of a head actuator in the disk drive, the servo system having a head actuator drive circuit that applies a current to a head actuator to cause the head actuator to move a head to a selected track of the storage media, the mobile device comprising:
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means for receiving an environment signal that indicates whether the mobile device is operating in the docked environment or the mobile environment;
means for rotating the storage media at a same nominal operating angular velocity in the mobile environment and in the docked environment; and
means for responding to the environment signal and to the command from the mobile device to perform one of;
applying a first set of digital values to the head actuator drive circuit to apply a first current profile to the head actuator to cause the head actuator to move the head to the selected track with a first velocity profile when the environment signal indicates that the mobile device is in the docked environment; and
applying a second set of digital values to the head actuator drive circuit to apply a second current profile to cause the head actuator to move the head to the selected track with a second velocity profile when the environment signal indicates that the mobile device is in the mobile environment.
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Specification