Write Data Transformer Reuse for ITI Cancellation
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Solution Overview
Problem
Current methods for inter-track interference (ITI) cancellation in magnetic storage systems are time-consuming and require cooperation between multiple components from different companies, making them inefficient and costly.
Innovation Solution
A magnetic storage system that reuses a write data transformer to remove ITI during the read process by generating and utilizing media level data from adjacent sectors, performing transformations like LDPC encoding and decoding, to minimize the addition of new logic and components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional ITI cancellation methods are used, then ITI removal is achieved, but additional components and increased device complexity are required
Solution Approach 1:
The write data transformer is designed to perform both its original write function and the additional function of generating media level data for ITI cancellation during read operations. This multi-functionality eliminates the need for separate dedicated components, reducing device complexity while maintaining effective ITI removal capability
Solution Approach 2:
The patent combines the ITI cancellation functionality with the existing write data transformer component. By merging these functions into a single component, the system avoids adding separate dedicated hardware for ITI cancellation, thereby reducing overall device complexity and component count
2Object-affected harmful factors
If traditional ITI cancellation methods are used, then ITI removal is achieved, but more memory resources are consumed
Solution Approach 1:
Existing memory resources within the write data transformer and associated processing units are repurposed to store and process media level data for ITI cancellation. This approach avoids allocating additional dedicated memory resources while still providing sufficient capacity for the cancellation operation
3Object-affected harmful factors
If separate components are used for ITI cancellation, then ITI removal functionality is achieved, but manufacturing cost increases
Solution Approach 1:
By designing the write data transformer to handle both write operations and ITI cancellation data generation, the patent reduces the total component count that requires manufacturing, assembly, and testing. This consolidation directly lowers manufacturing costs while maintaining full ITI removal functionality
Solution Approach 2:
The consolidation of ITI cancellation functionality into existing components reduces the bill of materials and assembly complexity, leading to lower manufacturing costs
4Object-affected harmful factors
If additional logic is added for ITI cancellation, then ITI removal capability is improved, but semiconductor size increases
Solution Approach 1:
The write data transformer is enhanced to perform dual functions: original write data transformation and generation of media level data for ITI cancellation. This approach adds minimal logic since it leverages existing computational resources and data paths, thereby minimizing the increase in semiconductor area while improving ITI removal capability
Data Source
AI summary
User level data associated with a location adjacent to a desired location on a magnetic disk storage is received. Media level data associated with the adjacent location is generated based at least in part on the user level data associated with the adjacent location; a processor which is configured to generate the media level data associated with the adjacent location is a same processor which is configured to generate media level data based at least in part on user level data during a write process. The media level data associated with the adjacent location is used to remove inter-track interference (ITI) associated with the adjacent location from a signal read back from the desired location.