Magnetic Recording Column Overlap Control for Shingle Error Reduction
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Solution Overview
Problem
In high-density magnetic recording, external disturbances can cause magnetization patterns at the start or end of recording columns to remain unwritten, leading to reproduction errors due to non-overlapping issues in Shingle recording methods.
Innovation Solution
A magnetic recording reproducing apparatus with a controller that adjusts the recording start and end positions of each column to ensure partial overlap with adjacent columns, preventing magnetization patterns from remaining unwritten by positioning the start upstream and end downstream of the adjacent column's start and end positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If recording is performed with the same start position in each recording column to increase recording density, then the number of tracks per unit length increases significantly, but magnetization patterns at the start or end of recording columns remain unwritten due to external disturbances causing position shifts
Solution Approach 1:
The patent applies preliminary action by extending the recording range of each recording column beyond the nominal track boundaries. Specifically, each recording column is recorded to overlap with adjacent columns by a predetermined distance (e.g., 0.5-2.0 μm), so that even if position shifts occur during recording due to external disturbances, the magnetization patterns at track boundaries are still completely overwritten. This advance preparation of extended recording ranges prevents reproduction errors without reducing recording density.
2Quantity of substance
If recording columns are positioned to partially overlap adjacent columns, then recording density is improved, but position shifts cause magnetization patterns to be left without overwriting at track boundaries
Solution Approach 1:
The patent applies parameter changes by modifying the recording parameters of adjacent recording columns. Specifically, the recording start and end positions are shifted by predetermined amounts (e.g., 0.5-2.0 μm) to create overlapping regions. This parameter adjustment ensures that even with position shifts during recording, the magnetization patterns at track boundaries are completely overwritten, thereby maintaining manufacturing precision while achieving high track density.
3Productivity
If the pitch of tracks is reduced to approximately the same as the shortest mark length to increase recording density, then the number of tracks per unit length increases to several times more, but external disturbances cause recording start and end positions to shift, leaving magnetization patterns unwritten
Solution Approach 1:
The patent applies preliminary action by pre-establishing overlapping recording ranges that extend beyond the nominal track boundaries. Each recording column is recorded to overlap with adjacent columns by a predetermined distance (e.g., 0.5-2.0 μm), creating a buffer zone that compensates for position shifts caused by external disturbances. This advance preparation ensures complete overwriting of magnetization patterns at track boundaries without reducing the already minimized track pitch.
Solution Approach 2:
The patent applies beforehand cushioning by creating overlapping recording regions that act as a protective buffer against position shifts. The extended recording range (e.g., 0.5-2.0 μm overlap) serves as a cushion that absorbs the impact of external disturbances, ensuring that magnetization patterns at track boundaries are completely overwritten even when position accuracy deteriorates due to environmental factors.
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 solution reduces reproduction errors by ensuring complete overlap and overwrite of magnetization patterns, enhancing recording density and reliability.
Implementation Method 1
a magnetic recording element which records information by applying a recording magnetic field to the magnetic recording medium to form recording columns
Implementation Method 2
a magnetic reproducing element which reproduces information by detecting a leaked magnetic field from the magnetic recording medium
Data Source
AI summary
A magnetic recording element records information by applying a recording magnetic field to a magnetic recording medium having an information recording area to form a plurality of recording columns extending in a first direction. Recording by the magnetic recording element is performed so that a first recording column and a second recording column formed before the first recording column partially overlap each other in a second direction perpendicular to the first direction, and that a recording start position of the first recording column is positioned upstream, relative to the recording direction, of a recording start position of the second recording column.