A storage controller includes a prefetch buffer configured to buffer data prefetched from a non-volatile memory during a prefetch operation, a determiner circuit configured to output one of the prefetched data and normal data read from the non-volatile memory, as read data, and a prefetch control circuit configured to enable the prefetch operation during a first time when a sequential read operation is performed on the non-volatile memory, disable the prefetch operation at a second point after the first time, and enable the prefetch operation or maintain the disable of the prefetch operation according to performance of the read data in a prefetch suspend period after the second time in which the prefetch operation is disabled.