SSD Wear Leveling Control for Secure Print Data Erasure
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Solution Overview
Problem
Existing information processing apparatuses using solid state drives (SSDs) face challenges in securely overwriting and erasing print data due to the wear leveling function, which affects the longevity of the SSD and requires additional memory or encryption methods that compromise security or cost-effectiveness.
Innovation Solution
An information processing apparatus that dynamically changes the writing distribution function based on job requirements, prioritizes secure data processing by canceling the distribution function, and performs overwrite erasure using a predetermined value in the SSD, ensuring secure data deletion without compromising SSD longevity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the writing distribution function (wear leveling) is enabled in the SSD, then the longevity of the SSD is improved, but the ability to securely overwrite and erase data is deteriorated
Solution Approach 1:
The patent applies the dynamics principle by making the wear leveling function adjustable rather than fixed. The control unit dynamically changes the writing distribution setting based on the type of data being stored - disabling it for high-security data that requires reliable overwriting while enabling it for general data to extend SSD lifespan. This dynamic adjustment resolves the contradiction between longevity and data security.
2Reliability
If the writing distribution function is disabled to enable secure overwrite, then data security is improved, but the SSD longevity is deteriorated due to concentrated writing
Solution Approach 1:
The patent applies local quality by applying different writing distribution strategies to different data types. High-security data (print data, personal information) is stored in regions where wear leveling is disabled to ensure secure overwriting, while other data can utilize wear leveling for extended longevity. This localized approach allows simultaneous optimization of both security and lifespan for different data categories.
3Reliability
If encryption is used to secure data in SSD, then data security is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the security function from complex encryption mechanisms and implements it through a simpler approach: controlling the wear leveling function itself. By making the wear leveling adjustable, the system achieves secure data overwriting without requiring additional encryption hardware, keys management systems, or complex protocols, thus resolving the contradiction between security and complexity.
Data Source
AI summary
An information processing apparatus which stores process target data in a non-volatile memory, cancels a writing distribution function with respect to the non-volatile memory according to a job input to the information processing apparatus or a mode of the information processing apparatus, and can efficiently perform overwrite erasure.