Shingled Recording Apparatus Radial Deviation Detection
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Solution Overview
Problem
In the shingled-recording method, efficient and proper information rewriting on a recording track and an adjacent track that is overlapped cannot be performed effectively, due to the phenomenon of drifted-off writing caused by the shift of the recording head.
Innovation Solution
An information recording device with a magnetic disk, a recording control module, a detection module, and a rewrite control module is configured to detect radial deviations and perform information rewriting in data regions between servo regions, determining the rewriting location based on threshold values to correct for positional errors and prevent erroneous recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If shingled-recording method is used to increase recording capacity, then recording density is improved, but rewriting efficiency deteriorates due to drifted-off writing
Solution Approach 1:
The patent applies preliminary action by detecting drifted-off writing before rewriting operations are performed. The detection module identifies radial deviations in advance, allowing the system to pre-determine which tracks require rewriting and which do not, thereby avoiding unnecessary rewriting operations and improving overall rewriting efficiency in shingled-recording systems.
Solution Approach 2:
The patent implements feedback by using the detection module to continuously monitor recording head position and identify drifted-off writing. This feedback mechanism provides real-time information about radial deviations, enabling the control module to make informed decisions about rewriting operations and adjust the rewriting strategy accordingly, thus resolving the contradiction between recording capacity and rewriting efficiency.
2Manufacturing precision
If track-by-track rewriting is performed to correct drifted-off writing, then recording accuracy is improved, but processing time increases
Solution Approach 1:
The patent applies the taking out principle by extracting only the specific tracks that require rewriting based on drifted-off writing detection. Instead of performing track-by-track rewriting on all tracks, the system identifies and isolates only those tracks with radial deviations, rewriting only the necessary portions. This selective approach maintains recording accuracy while significantly reducing the overall processing time required.
3Reliability
If rewriting is performed on adjacent tracks to prevent drifted-off writing, then recording reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the rewriting control into distinct functional modules: a detection module for identifying drifted-off writing, a control module for determining rewriting necessity, and an execution module for performing rewriting. This segmented architecture manages the complexity of controlling adjacent track rewriting while ensuring recording reliability through systematic, modular error prevention.
Data Source
AI summary
An information recording device includes a magnetic disk, a recording control module, a detection module, and a rewrite control module. Tracks are defined on the magnetic disk, each track includes servo regions including position information and data regions. The recording control module performs a control so that information is recorded on a first track by a recording method where recording is performed with adjacent tracks overlapped with each other. The detection module detects, based on position information acquired from a first servo region, whether a shift recording is performed so as to be shifted from a reference in a radial direction on the first track. The rewrite control module performs, when the shift recording is detected, a control so that information is re-recorded in a data region between a first servo region and a second servo region that precedes the first servo region.