Storage control system with power-off time estimation mechanism and method of operation thereof

摘要

A storage control system, and a method of operation thereof, including: a power-down module for powering off a memory sub-system; a decay estimation module, coupled to the power-down module, for estimating a power-off decay rate upon the memory sub-system powered up, the power-off decay rate is for indicating how much data in the memory sub-system has decayed while the memory sub-system has been powered down; and a recycle module, coupled to the decay estimation module, for recycling an erase block for data retention based on the power-off decay rate.

主权项

1. A method of operation of a storage control system comprising:
powering off a memory sub-system; estimating power-off decay in respective blocks of a set of blocks of the memory sub-system upon the memory sub-system powering up, wherein the estimated power-off decay for a particular block is a numerical value indicating how much data in the particular block of the memory sub-system has decayed while the memory sub-system has been powered down, and the estimated power-off decay for the particular block is calculated as a function of a difference between a pre-power-down threshold voltage and a post-power-up threshold voltage; and identifying blocks in the memory sub-system for which the estimated power-off decay has reached a threshold and recycling at least the identified blocks in the memory sub-system for data retention; wherein estimating power-off decay includes calculating a power-off time for indicating how long the memory sub-system has been powered off and estimating the power-off decay as a function of the power-off time.