Recording Medium Controller Escape Area Shingle Recording
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Solution Overview
Problem
The shingle recording technique for increasing hard disk capacity results in data loss due to overlapping tracks, requiring lengthy data rewriting processes per unit track group, which slows down data writing operations.
Innovation Solution
A recording medium controller with a write area and an escape area, where data is temporarily stored in the escape area before being merged and written to spare track groups using the shingle recording technique, allowing for efficient data updating and reducing writing time by avoiding the need to rewrite entire track groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If shingle recording technique is used to increase track density, then recording capacity is improved, but data loss occurs due to overlapping tracks
Solution Approach 1:
The magnetic disk surface is divided into distinct zones: shingle recording areas where overlapping tracks increase capacity, and escape areas where non-overlapping tracks preserve data integrity. This segmentation allows simultaneous optimization of both capacity and data safety.
Solution Approach 2:
The escape area acts as an intermediary storage region that receives data before it is safely written to the shingle recording area. This intermediate step prevents direct data loss by providing a buffer zone for data verification and recovery.
2Reliability
If data is written per unit track group to prevent data loss, then data integrity is improved, but writing time increases
Solution Approach 1:
Data is preliminarily written to the escape area before being transferred to the shingle recording area. This preliminary action allows the system to prepare data in a safe location, reducing the time required for critical writing operations while maintaining integrity through the escape area buffer.
3Quantity of substance
If track widths are decreased to increase track density, then recording capacity is improved, but adjacent tracks overlap causing data loss
Solution Approach 1:
Different regions of the magnetic disk have different quality characteristics: shingle recording areas use narrow overlapping tracks for maximum capacity, while escape areas use wider non-overlapping tracks for data safety. This local differentiation optimizes each region for its specific purpose.
Data Source
AI summary
According to one embodiment, a recording medium controller includes a recording medium, an input module, a reading module, and a writing module. The recording medium includes a write area and an escape area. The write area includes track groups. Each of the track groups is a unit for writing data and includes tracks. The input module receives a write command for data. The reading module reads data stored in the escape area and data from a first track group of the track groups. The writing module writes data received for the write command to the escape area, and writes merged data obtained by merging the data read from the escape area and the data read from the first track group to each track of a second track group of the track groups by using a shingle recording technique in which adjacent tracks are partly overlapped with each other.