Disk Surface Dual Format Adaptation for Head Degradation
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Solution Overview
Problem
Data storage devices face challenges in maintaining data integrity and capacity when head degradation occurs, as existing technologies do not efficiently adapt to changes in recording density without compromising data or reducing disk surface capacity.
Innovation Solution
The implementation of a dual format system on a disk surface, where data is written and read using a lower recording density format after detecting head degradation, allowing previously written data to remain accessible in the original format, and reserving a pad area for reformatting without reducing overall capacity, ensuring continuous data access and integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the disk surface is reformatted to a lower recording density format, then data integrity is maintained and the head can continue to operate, but the storage capacity of the disk surface is reduced
Solution Approach 1:
The disk surface is divided into two distinct format zones: a first format area with higher recording density for maximizing storage capacity, and a second format area with lower recording density for maintaining data integrity when head degradation occurs. This segmentation allows the system to simultaneously preserve both capacity and reliability by directing writes to appropriate zones based on head condition
Solution Approach 2:
The system dynamically switches between writing data in the first format and the second format based on detected head degradation. The control circuitry monitors head performance and adaptively selects the appropriate format zone, transitioning from the higher density first format to the more tolerant second format when degradation is detected, thereby maintaining data integrity while preserving overall capacity
2Quantity of substance
If a pad area is reserved for reformatting, then the disk can be reformatted without reducing overall capacity, but the device complexity increases
Solution Approach 1:
The reserved pad area serves multiple functions: it acts as a transition zone for reformatting operations, provides a buffer for format conversion, and enables the disk to maintain overall capacity by preventing format-related capacity loss. This multi-functional use of the pad area justifies the added complexity by delivering multiple benefits from a single structural element
Solution Approach 2:
The pad area is pre-reserved and pre-configured before reformatting operations are needed. By establishing this buffer zone in advance, the system prepares the disk surface for future format transitions, ensuring that when head degradation occurs, the reformatting can proceed without capacity loss and without requiring complex real-time restructuring
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 ensures that data integrity is maintained while preserving capacity by allowing data to be read and written in a lower recording density format, preventing overwriting of valid data and enabling efficient reformatting of disk surfaces due to head degradation, thus extending the life of the storage device.
Implementation Method 1
Data is typically written to the disk by modulating a write current in an inductive coil (write coil) to record magnetic transitions onto the disk surface in a process referred to as saturation recording
Implementation Method 2
During read-back, the magnetic transitions are sensed by a read element (e.g., a magneto-resistive element) and the resulting read signal demodulated by a suitable read channel
Implementation Method 3
Conventional heads may also comprise an actuator for controlling the fly height. Any suitable fly height actuator (FHA) may be employed, such as a heater which controls fly height through thermal expansion
Data Source
AI summary
A data storage device is disclosed comprising a first disk surface comprising a plurality of data tracks, and a first head actuated over the first disk surface. First data is written to the first disk surface based on a first format. At least part of the first disk surface is reformatted based on a second format, wherein the second format defines a lower recording density for the first disk surface as compared to a recording density defined by the first format. After reformatting the at least part of the first disk surface, second data is written to the first disk surface based on the second format and the first data is read from the first disk surface based on the first format.