Storage device and method of operating storage device

Abstract

A storage device includes at least one nonvolatile memory device, a volatile memory device and a storage controller. The storage controller performs an error correction code (ECC) decoding on a read data read from the volatile memory device, in response to uncorrectable errors being detected in the read data, corrects the uncorrectable errors that are not correctable by the ECC decoding to generate corrected data by performing an erasure decoding on the read data, replaces a defective word-line of a first memory region with a redundancy word-line of a second memory region by performing a soft post package repair PPR on the first memory region that stores the read data, stores the corrected data in the second memory region and performs a re-read operation on the second memory region.