Shared Encryption Processor for Inter-Track Interference Cancellation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In magnetic disk devices, inter-track interference (ITI) during data read poses challenges that require separate encryption circuits and keys for write and read paths, complicating the data processing and increasing circuit scale and power consumption.
Innovation Solution
A shared encryption processor and key management system are implemented within the read and write channel, allowing the encryption processor to handle both write and read data paths, thereby canceling inter-track interference while reducing the need for separate encryption circuits and keys.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate encryption circuits and keys are provided for write and read data paths to enable ITI cancel read, then data security is maintained, but device complexity and power consumption increase
Solution Approach 1:
The patent merges the encryption circuits and keys from separate write and read data paths into a shared resource. The encryption circuit now serves both write operations (encrypting data before storage) and read operations (decrypting data after retrieval), eliminating the need for duplicate encryption hardware and reducing overall device complexity while maintaining security.
Solution Approach 2:
The encryption circuit is designed with multi-functionality to handle both encryption and decryption operations for different data paths. By making the encryption circuit universal, it can process write data encryption and read data decryption using the same hardware resources, thereby reducing the number of dedicated components needed.
2Reliability
If separate encryption circuits and keys are provided for write and read data paths, then encryption functionality is ensured, but power consumption increases
Solution Approach 1:
By combining the encryption functions into a single shared circuit, the patent reduces the total power consumption associated with encryption operations. Instead of having two separate encryption circuits consuming power simultaneously, one shared circuit handles both write and read encryption/decryption tasks, thereby halving the redundant power usage.
Solution Approach 2:
The universal encryption circuit performs multiple functions (encryption for write, decryption for read) using the same hardware, which reduces overall power consumption compared to having dedicated encryption circuits for each data path that would operate independently and consume duplicate power.
3Adaptability or versatility
If separate encryption circuits are provided for write and read paths, then data path independence is maintained, but the number of components increases
Solution Approach 1:
The patent merges the encryption components from separate write and read paths into a single shared encryption circuit. This consolidation reduces the total number of components in the system while maintaining the functional independence of the data paths through proper timing and control mechanisms.
Data Source
AI summary
According to one embodiment, a magnetic disk device includes a read and write channel transfers data to/from a magnetic disk; a data processor cancels an inter-track interference in data read; an encryption decode processor which is provided in common through a write data path and a read data path in the read and write channel and executes an encryption processing and a decode processing for the data to be transferred to/from the magnetic disk; and an encryption decode processing bypass module bypasses the encryption processing or the decode processing through the encryption decode processor in a cancellation of the inter-track interference in the data processor.