GuardedErase: Extending SSD Lifetimes by Protecting Weak Wordlines
summary
Proposes GuardedErase, a per‑wordline erase‑voltage control that slows wear on weak wordlines so blocks reach their true endurance instead of failing early; implements a hardware circuit to apply different erase voltages, measures real 3D NAND chips to build an endurance model under varied voltages, and defines nine modes that trade capacity for lifetime. Integrates the scheme into an FTL called longFTL, achieving about 21% average SSD lifetime improvement with negligible I/O performance loss.
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