Magnetic Disk Track Adjustment for Unused Sector Reduction
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Solution Overview
Problem
Existing magnetic disk devices face challenges in optimizing the number of sectors and tracks to enhance recording capacity and efficiency, particularly in hybrid recording systems that combine shingled and conventional magnetic recording methods, leading to inefficiencies in data storage density and utilization.
Innovation Solution
A magnetic disk device with an adjustment unit that dynamically adjusts the number of sectors and tracks, along with sector length, to optimize shingled and conventional recording processes, ensuring that the number of unused sectors is less than the total number of tracks, thereby enhancing recording capacity and density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the number of sectors and tracks is increased to enhance recording capacity, then data storage density is improved, but the number of unused sectors increases leading to reduced utilization efficiency
Solution Approach 1:
The patent implements dynamic adjustment of sector and track parameters based on actual data storage needs. The control unit monitors the state of data areas and dynamically modifies the number of sectors per track and track spacing to optimize both recording capacity and utilization efficiency, preventing the system from being locked into fixed inefficient configurations
Solution Approach 2:
The patent changes key parameters including the number of sectors per track, sector length, and track pitch to eliminate unused sectors. By adjusting these parameters dynamically rather than using fixed values, the system achieves optimal balance between recording capacity expansion and utilization efficiency, ensuring that e < t+1 condition is maintained
2Quantity of substance
If shingled magnetic recording is used to increase data density, then recording capacity is improved, but complex coordination between overlapping tracks becomes difficult to manage
Solution Approach 1:
The control unit implements feedback mechanisms to monitor the state of shingled tracks and dynamically adjust writing parameters. By continuously monitoring track overlap conditions and adjusting sector/track parameters accordingly, the system manages the complexity of coordinating overlapping tracks while maintaining high data density, ensuring proper head positioning and data integrity across shingled regions
3Quantity of substance
If the number of tracks is increased to improve storage capacity, then recording capacity is enhanced, but the proportion of unused sectors relative to total tracks increases
Solution Approach 1:
The patent employs asymmetric adjustment where the number of sectors per track and track spacing are modified differently to eliminate unused sectors. Rather than uniformly increasing both tracks and sectors, the system applies asymmetric changes tailored to specific regions, ensuring that e < t+1 is maintained while maximizing storage capacity utilization
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach improves data storage efficiency by minimizing unused sectors, allowing for higher data density and better utilization of available space on the disk, thus optimizing the recording capacity and reducing inefficiencies in hybrid recording systems.
Implementation Method 1
a write head writing data to a disk
Data Source
AI summary
According to one embodiment, a magnetic disk device includes a disk, a write head, an adjustment unit, and a write processing unit. The adjustment unit adjusts each of a first adjustment value, a second adjustment value, and a third adjustment value. The write processing unit can select shingled magnetic recording and perform write processing based on the first to third adjustment values. When the number of the plurality of tracks of the band is t+1 and the number of unused sectors among the plurality of sectors of the band is e. The adjustment unit adjusts the first to third adjustment values to establish e<t.