Unveiling Proactive Recovery's Preventative Impact on NAND Flash Wearout
Abstract: The Proactive Recovery technique for flash memory, also known as the flash's Circadian Rhythm, has shown a remarkable increase in endurance by up to nine times and a twofold improvement in sustainability by implementing early recovery. Despite its benefits, a detailed model capturing Proactive Recovery behaviors was missing in the literature, with existing models failing to account for its preventative benefits. This paper proposes enhanced stress and recovery models integrated into a real-time simulation algorithm, emphasizing their interdepen-dence and the criticality of timing. Our model, which accurately considers recovery timing and length, is validated against experimental findings. The simulation model is compatible with current and future flash memory technologies, outlining its application for reliable Solid State Drives (SSDs). The overarching goal of our model development is to pave the way for accurate analysis and design of reliability enhancement techniques at the system level, leveraging state-of-the-art SSD simulators.
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