SSD Wear Leveling via Static Content Mapping

The patent applies local quality by differentiating between static and dynamic logical regions and assigning them to different physical regions based on wear characteristics. Static regions (unchanging data) are mapped to high-wear physical regions, while dynamic regions (frequently updated data) are mapped to low-wear physical regions. This localized differentiation ensures that high-wear areas are utilized for data that doesn't require frequent rewriting, thereby extending overall SSD reliability while maintaining increased storage capacity through multiple memory modules.

The patent implements preliminary action by proactively monitoring wear counts of physical regions and preemptively remapping static logical regions to high-wear physical regions before those regions fail. The controller continuously tracks erase cycle counts and identifies when physical regions exceed wear thresholds, then performs remapping operations to distribute future write operations away from vulnerable areas. This preventive approach maintains storage accessibility while extending module lifespan by avoiding operations on near-failure regions.

The patent applies periodic action by implementing wear leveling remapping only when specific wear threshold conditions are met, rather than performing continuous or frequent remapping operations. The controller monitors wear counts and triggers remapping events periodically when the difference between maximum and minimum wear counts exceeds predefined thresholds. This conditional, periodic approach achieves sufficient wear distribution uniformity while minimizing performance degradation by avoiding unnecessary remapping operations during normal system operation.