Disk Device Head Parameter Mapping for Adjustment Time Reduction
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Solution Overview
Problem
The increasing number of setting parameters in disk devices makes it difficult to efficiently adjust operations of the head to achieve optimal record quality, such as bit error rate, within a reasonable processing time, especially as new parameters are added, leading to inefficient adjustment algorithms and potential falls in record quality.
Innovation Solution
The implementation of mapping information that associates parameter sets with a one-dimensional adjustment variable, allowing for the conversion of multidimensional setting parameters into a single current characteristic value, significantly reducing adjustment time by using a current characteristic value (IWS) and its variation (σIWS) to determine optimal parameter sets for head operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of setting parameters is increased to improve head operation control, then the precision of head operation control is improved, but the adjustment time and processing complexity increase significantly
Solution Approach 1:
The patent transforms the multidimensional parameter adjustment problem into a one-dimensional search problem by introducing a single adjustment variable that controls multiple setting parameters simultaneously. This dimensional reduction allows the system to maintain precise head operation control while significantly reducing the adjustment time required, as the controller only needs to search along one dimension rather than navigating a complex multidimensional parameter space.
Solution Approach 2:
The adjustment variable serves as a universal control parameter that simultaneously adjusts multiple setting parameters (write current parameters, signal processing parameters, etc.). This multi-functional approach allows a single variable change to coordinate adjustments across different parameter groups, improving efficiency while maintaining the precision benefits of having multiple parameters.
2Manufacturing precision
If multiple setting parameters are adjusted independently to achieve optimal record quality, then the record quality is improved, but the adjustment algorithm complexity increases
Solution Approach 1:
By mapping multiple setting parameters to a one-dimensional adjustment variable space, the patent simplifies the adjustment algorithm from a complex multidimensional optimization problem to a straightforward one-dimensional search. The controller evaluates the adjustment variable, determines corresponding setting parameters using mapping information, and achieves optimal record quality without requiring complex algorithms to navigate multiple independent parameter adjustments.
Solution Approach 2:
The adjustment variable acts as an intermediary that mediates between the control input and multiple setting parameters. Instead of directly adjusting each parameter independently, the controller adjusts the single adjustment variable, which then determines the appropriate values for multiple setting parameters through pre-established mapping relationships, thereby simplifying the adjustment algorithm.
3Adaptability or versatility
If new setting parameters are added to disk devices to enhance functionality, then the device versatility is improved, but the adjustment processing time increases
Solution Approach 1:
The adjustment variable serves as a universal control mechanism that can accommodate multiple types of setting parameters (write current parameters, signal processing parameters, and any future parameters) through a single variable. This allows the disk device to gain enhanced functionality with multiple parameter types while maintaining efficient adjustment processing time, as all parameters are coordinated through the one-dimensional search of the adjustment variable rather than requiring separate adjustments for each parameter.
Data Source
AI summary
According to one embodiment, there is provided a disk device including a head and a controller. The controller, with mapping information in which parameter sets each including multiple types of parameters related to operations of the head are mapped to an adjustment variable so as to be associated with multiple different values of the adjustment variable, evaluates operations of the head while changing the value of the adjustment variable contained in the mapping information and determines a parameter set corresponding to an appropriate value of the adjustment variable based on the evaluation results and the mapping information to set for operations of the head using the determined parameter set.