Storage controller performing partial refresh operation, storage device including the same, and method of operating the same

Abstract

Disclosed is a method of operating a storage controller which includes a volatile memory device. The method includes determining whether a low-power mode is available, based on validity bitmap information indicating invalidity of first data stored in a first memory region of a first sub-block of the volatile memory device and validity of second data stored in a second memory region of a second sub-block of the volatile memory device, overwriting the second data to the first memory region based on the validity bitmap information, in response to determining that the low-power mode is available, storing first mapping information including a fixed index value corresponding to the first memory region and a migration index value corresponding to the overwritten second data in a metadata table, and performing a partial refresh operation corresponding to the first sub-block after overwriting the second data.