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US 8,009,379 B2Granted
Method, apparatus and program storage device for dynamically adjusting the write current in each head to compensate for variation in disk drive and environmental parameters
AssigneeHitachi Global Storage Technologies Netherlands B.V.
InventorLarry L. Williams
Life of this patent
Estimating the term…
Abstract
A method, apparatus and program storage device for dynamically adjusting the write current in each head to compensate for variation in disk drive and environmental parameters is disclosed. A current in the write head is dynamically adjusted to compensate for variations in the components and environment by periodically measuring the writability of the drive and adjusting the write current such that the parameter stays within predetermined criteria.
Claims25
A method for dynamically adjusting the write current in a write head, comprising:
- monitoring a plurality of parameters affecting writability of a write head of a disk drive to detect a difference in the ability of the write head to write information on the media as the difference occurs due to any variation in magnetic characteristics of the recording medium, any variation in head mechanical characteristics and any variation in environmental parameters;
- and
- dynamically adjusting write current in response to detecting the difference in writability as the difference occurs during the monitoring of the plurality of parameters affecting writability of the write head to the recording medium to account for any variation in magnetic characteristics of the recording medium, any variation in head mechanical characteristics and any variation in environmental parameters until writability of the write head to the recording medium meets a predetermined criteria.
A data storage system, comprising:
- a recording medium for storing data thereon;
- a transducer disposed proximate the recording medium for reading and writing data on the recording medium;
- an actuator, coupled to the transducer, for moving the transducer relative to the recording medium;
- and
- a signal processing system, coupled to the transducer, the signal processing system being configured for monitoring a plurality of parameters affecting writability of a write head of a disk drive to detect a difference in the ability of the write head to write information on the media as the difference occurs due to any variation in magnetic characteristics of the recording medium, any variation in head mechanical characteristics and any variation in environmental parameters and dynamically adjusting write current in response to detecting the difference in writability as the difference occurs during the monitoring of the plurality of parameters affecting writability of the write head to the recording medium to account for any variation in magnetic characteristics of the recording medium, any variation in head mechanical characteristics and any variation in environmental parameters until writability of the write head to the recording medium meets a predetermined criteria.
2 more elements
A data storage system, comprising:
- means for storing data thereon;
- means for translating the means for storing data;
- means, disposed proximate the means for storing data, for reading and writing data on the means for storing data;
- means, coupled to the means for reading and writing data, for moving the means for reading and writing data relative to the means for storing data;
- and
- means, coupled to the means for reading and writing data, for monitoring a plurality of parameters affecting writability of a write head of a disk drive to detect a difference in the ability of the write head to write information on the media as the difference occurs due to any variation in magnetic characteristics of the recording medium, any variation in head mechanical characteristics and any variation in environmental parameters and dynamically adjusting write current in response to detecting the difference in writability as the difference occurs during the monitoring of the plurality of parameters affecting writability of the write head to the recording medium to account for any variation in magnetic characteristics of the recording medium, any variation in head mechanical characteristics and any variation in environmental parameters until writability of the write head to the recording medium meets a predetermined criteria.
3 more elements
A non-transitory computer-readable medium tangibly embodying a program instructions executable by a processing device to cause the processing device to perform operations for dynamically adjusting the write current in each head in a storage system to compensate for variation in storage system and environmental parameters, the operations comprising:
- monitoring a plurality of parameters affecting writability of a write head of a disk drive to detect a difference in the ability of the write head to write information on the media as the difference occurs due to any variation in magnetic characteristics of the recording medium, any variation in head mechanical characteristics and any variation in environmental parameters;
- and
- dynamically adjusting write current in response to detecting the difference in writability as the difference occurs during the monitoring of the plurality of parameters affecting writability of the write head to the recording medium to account for any variation in magnetic characteristics of the recording medium, any variation in head mechanical characteristics and any variation in environmental parameters until writability of the write head to the recording medium meets a predetermined criteria.
Dependencies are inferred from the claim text.