Namespace-Segregated Wordline Layout for Multi-Namespace SSD Erase Efficiency

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Solution Overview

Problem

In multi-namespace SSDs, writing data for different namespaces to the same wordlines increases write amplification and latency during erase operations.

Innovation Solution

The controller identifies namespace identifiers in incoming data and segregates it accordingly, writing the segregated data to specific wordlines, maintaining separate valid data frame counts, and programming wordlines to a highest state for efficient and secure erase operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If data for different namespaces is written to the same wordlines, then storage space utilization is improved, but write amplification and latency during erase operations increase

Engineering Contradiction:

Improvestorage space utilizationVSAvoidwrite amplification and latency

Core Design Contradiction:

Quantity of substanceVSProductivity

Solution Approach 1:

The patent divides the wordlines into namespace-specific segments within a virtual block. Each namespace is assigned dedicated wordlines, allowing data to be segregated by namespace while maintaining efficient erase operations. This segmentation prevents mixed-namespace data from causing write amplification and reduces latency during erase operations.

Inventive Principle:

Principle #1Segmentation

2Productivity

If data is segregated by namespace to reduce write amplification, then erase operation efficiency is improved, but device complexity increases

Engineering Contradiction:

Improveerase operation efficiencyVSAvoiddata segregation management

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The controller is designed to handle multiple namespaces through a unified virtual block structure. The same virtual block can accommodate data from different namespaces with dedicated wordlines, allowing the system to maintain simplicity in data management while achieving efficient erase operations through namespace-aware segmentation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260064277A1Namespace data segregation in a multi-namespace memory device

Publication Date: 2026.03.05 MICROCHIP TECHNOLOGY INC

AI summary

A data storage system includes a memory device and a controller. The memory device includes a plurality of wordlines. The controller includes processor(s) and a memory. The memory includes instructions, that when executed the processor(s), cause the processor(s) to: identify, from incoming data, a plurality of namespace identifiers (IDs) corresponding to a plurality of namespaces; segregate the incoming data according to the plurality of namespace IDs; and write the segregated incoming data to respective ones of the plurality of wordlines.