Memory system for performing read reclaim

Abstract

Disclosed is a memory system including a memory device including a plurality of memory blocks, and a controller suitable for controlling the memory device to perform pre-read reclaim on pre-victim blocks of pre-read blocks among the plurality of memory blocks, the pre-victim blocks including uncorrectable errors, the pre-read blocks being blocks on which a pre-read operation has been performed. The memory system performs read reclaim operations to improve the reliability of non-volatile memory. The controller performs the pre-read operation on sequential data stored in the memory blocks and determines pre-victim blocks based on uncorrectable errors detected during the pre-read operation. The controller reorders the reclaim sequence according to a priority among the pre-read reclaim, a normal read reclaim, and an internal read reclaim. These operations reduce read latency and prevent uncorrectable errors.