Removable SSD Data Retention via Internal Battery Refresh
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Solution Overview
Problem
Removable solid state drives with QLC NAND flash devices face data loss due to inability to perform NAND refresh without power supply, limiting their mass adoption as they lose data after months of disconnection.
Innovation Solution
A removable solid state storage system with a timer, wireless module, and removable battery that provides power for NAND storage refresh, including data refresh backup schemes and user alerts to prevent data loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If QLC NAND flash devices are used to increase storage capacity, then storage capacity is improved, but data retention time deteriorates
Solution Approach 1:
The patent implements preliminary action by performing data refresh operations before data loss occurs. The system monitors data age and proactively refreshes QLC NAND flash cells before their retention time expires, preventing data loss rather than reacting after failure. This is achieved through age-based refresh policies that trigger refresh operations at predetermined time intervals.
Solution Approach 2:
The patent employs feedback mechanisms by continuously monitoring data age, storage cell status, and retention time metrics. The system uses this feedback information to dynamically adjust refresh operations, notifying users when data approaches retention limits and automatically performing refresh operations based on real-time conditions.
2Ease of operation
If removable solid state drive is disconnected from power supply to enable portability, then portability is improved, but data retention deteriorates
Solution Approach 1:
The patent implements self-service by enabling the removable solid state drive to autonomously perform data refresh operations using its internal power source. The system monitors its own data retention status and automatically executes refresh operations without requiring external power or user intervention, allowing the device to maintain data integrity while being portable and disconnected from external power supplies.
3Duration of action of stationary object
If timer monitoring and user alert systems are added to prevent data loss, then data retention is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by designing the timer and alert system to serve multiple functions: monitoring data age, tracking storage cell status, triggering refresh operations, and notifying users. This multi-functional approach consolidates what could be separate complex subsystems into integrated components that perform multiple tasks within the existing storage drive architecture.
Data Source
AI summary
Systems, apparatus and methods are provided for managing a removable solid state storage system for data loss prevention. A method may include maintaining a standby mode for a timer of the removable solid state storage system until the removable solid state storage system is disconnected from an external power supply, setting an operation time interval on the timer, using the timer to count how long the removable solid state storage system has been disconnected, sending an interrupt to a storage controller of the removable solid state storage system from the timer when the timer counts to the operation time Interval, and performing data loss prevention operations using a power supplied by a removable battery.