Data Deletion Unit With Partial Erasure For Storage Security
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Solution Overview
Problem
Conventional data deletion methods in storage devices, such as hard disk drives, within image forming devices are inefficient as they require repeated access to storage media, leading to delays in input/output processing speed and increased resource usage, while also impacting the security of remaining data.
Innovation Solution
An electronic device with a storage unit and a deleting unit that deletes data in predetermined sized portions with varying spacing in row and column directions, or randomly, when the data becomes unnecessary, allowing for efficient deletion without interfering with input/output processes and ensuring data security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequential overwrite-delete is performed to ensure data security, then data security is improved, but input/output processing speed deteriorates due to repeated access to storage media
Solution Approach 1:
The storage medium surface is divided into multiple deletion regions with different deletion rates. Some regions use sequential deletion for high security requirements, while other regions use parallel deletion for faster processing. This segmentation allows simultaneous achievement of data security and processing speed by applying different deletion strategies to different data portions.
Solution Approach 2:
Instead of performing complete sequential overwrite-delete on the entire storage medium, the invention performs partial deletion on only the necessary portions. The deletion process targets specific deletion regions rather than the whole storage area, reducing the total number of access operations while maintaining adequate security for the most critical data portions.
2Reliability
If sequential overwrite-delete is performed immediately when data is no longer needed, then data security is improved, but resource usage increases due to continuous CPU and storage access
Solution Approach 1:
The invention performs partial deletion on only the necessary portions of storage medium rather than complete sequential overwrite-delete. This reduces the total computational workload and storage access operations, thereby lowering CPU usage and energy consumption while maintaining adequate security through targeted deletion of critical data regions.
Solution Approach 2:
By dividing the storage medium into multiple deletion regions with different deletion rates, the system can allocate resources more efficiently. High-priority security regions receive intensive sequential deletion resources, while lower-priority regions use resource-lighter parallel deletion, optimizing overall resource utilization.
3Reliability
If overwrite-delete is performed with frequent access to storage media, then data security is improved, but input/output processing efficiency deteriorates
Solution Approach 1:
The storage medium is segmented into multiple deletion regions that can be processed in parallel. This allows the system to maintain data security through comprehensive deletion coverage while improving input/output processing efficiency by eliminating the sequential bottleneck, as multiple regions are deleted simultaneously rather than one after another.
Data Source
AI summary
An electronic device includes a storage unit that stores therein input data, and a deleting unit that partially deletes the input data when the input data becomes unnecessary. The deleting unit deletes portions of the input data, each having a predetermined size, with predetermined or random spacing between the portions in row and column directions, or deletes only an effective portion of the input data.