Selective Purge Tag for Storage Device Data Erasure
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Solution Overview
Problem
Existing storage devices face a decrease in operating speed due to general purge schemes that physically erase all invalid data, which is inefficient and does not align with recent interface protocols for higher storage capacities and speeds.
Innovation Solution
A selective purge scheme is implemented, where a host device generates a write command with a selective purge tag, allowing the storage device to logically and physically erase data only from designated groups, preventing unnecessary data erasure and maintaining system performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a general purge scheme is used to physically erase all invalid data, then data security and storage space management are improved, but the operating speed of the storage device decreases
Solution Approach 1:
The patent segments invalid data into different groups based on their characteristics (e.g., recently invalidated data vs. older invalid data). The storage device then applies different purge strategies to different segments, physically erasing only the most critical invalid data while maintaining logical erase for less critical data, thereby reducing the overall purge time and maintaining operating speed while still ensuring data security.
Solution Approach 2:
The patent applies local quality by treating different invalid data differently based on their specific properties. Instead of uniformly erasing all invalid data, the system identifies and physically erases only the invalid data that requires security-level destruction, while other invalid data can be handled through lighter-weight logical erase operations, thus preserving storage device speed while meeting security requirements.
2Quantity of substance
If a general purge scheme is used to physically erase all invalid data, then storage space is cleared, but the storage capacity and processing speed are compromised
Solution Approach 1:
The patent applies partial action by physically erasing only the necessary invalid data rather than erasing all invalid data. The storage device identifies a subset of invalid data that needs physical erasure for space reclamation and security, while leaving other invalid data as-is or handling them through logical erase, thus achieving storage space clearance without excessively impacting processing speed or storage capacity.
3Speed
If a selective purge scheme is implemented, then operating speed is maintained, but the complexity of data management increases
Solution Approach 1:
The patent implements self-service by enabling the storage device to autonomously manage and categorize invalid data based on pre-established criteria. The storage device automatically identifies which invalid data requires physical erasure and which can be handled through logical erase, reducing the need for complex external management systems and maintaining operating speed while managing the complexity internally through standardized protocols.
Data Source
AI summary
A storage system includes a host device and a storage device. The host device generates a write command, a logical address of write data corresponding to the write command, and a selective purge tag indicating that the write data are targeted for selective purge. The storage device receives the write command, the logical address, and the selective purge tag, stores write data, and logically erases the stored write data upon receiving an erase command from the host device. In addition, the storage device physically erases the stored write data upon receiving a selective purge request from the host device.