Read Head Positioning via ITI Cancellation Weights
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Solution Overview
Problem
In magnetic disk apparatuses, achieving high-density data writing leads to read head positioning challenges, resulting in read errors due to write position deviations, which prolong processing time and lower data read performance, especially when tracks overlap.
Innovation Solution
The implementation of an ITI cancellation weight-based method to adjust the read head position, using the ITI cancellation weight as an index to predict the relative position of neighboring tracks and adjust the MR offset, thereby improving signal quality and reducing read errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If tracks are written at high density, then data storage capacity is improved, but read head positioning accuracy deteriorates due to write position deviations
Solution Approach 1:
The patent applies preliminary action by pre-adjusting the read head position based on ITI cancellation weights before actual data reading. The system calculates ITI cancellation weights during track writing and uses these weights to predict and compensate for write position deviations in advance, allowing the read head to be positioned at the optimal reading location before the read operation begins.
Solution Approach 2:
The patent implements feedback by using ITI cancellation weights as an index that reflects write position deviations. The system continuously monitors ITI cancellation weights and adjusts read head positioning based on this feedback information, creating a closed-loop control system that adapts to actual write position variations.
2Reliability
If read head position is repetitively corrected through read retry processing, then read errors are resolved, but processing time is prolonged and data read performance deteriorates
Solution Approach 1:
The patent eliminates the need for repetitive read retry processing by performing preliminary positioning adjustment using ITI cancellation weights before the read operation. This pre-positioning ensures that the read head is already at the optimal location, preventing read errors before they occur and avoiding time-consuming retry operations.
Solution Approach 2:
The patent replaces the mechanical trial-and-error approach of repetitive read retry positioning with a computational approach using ITI cancellation weights. Instead of physically moving the read head through multiple retry attempts, the system uses calculated weight values to directly determine the optimal read head position.
3Quantity of substance
If multiple tracks are written with partial overlap, then track density is improved, but the practical track width for reliable reading is narrowed
Solution Approach 1:
The patent uses ITI cancellation weights as feedback information that quantifies the effect of track overlap on signal quality. By monitoring these weights, the system can determine the actual effective track width and adjust read head positioning to optimize reading within the narrowed practical track width caused by overlapping writes.
Solution Approach 2:
The patent changes the positioning parameter (read head position) based on ITI cancellation weights to adapt to the narrowed practical track width. By adjusting the read head position according to these weights, the system optimizes reading performance within the constrained track width resulting from high-density overlapping writes.
Data Source
AI summary
According to at least one embodiment, a read/write apparatus includes a read module and a positioning module. The read module reads data of a predetermined data track using a read head. The positioning module positions the read head in accordance with an index indicating how much the read head reads data of a neighboring data track of the predetermined data track when the read head reads data of the predetermined data track.