Storage device with variable processing rate and operation method thereof

Abstract

An operating method of a storage device includes fetching, from an external host device, write command and write data, based on a 0-th fetch rate, storing the write data in a write cache region of a buffer memory device of the storage device, performing write cache processing with respect to the write cache region, based on a 0-th cache processing rate, the performing write cache processing including storing, in a nonvolatile memory device of the storage device, the write data of the write cache region, detecting a write cache level of the write cache region, and controlling the 0-th cache processing rate, based on the write cache level.