A method of operating a nonvolatile memory device comprising a plurality of memory blocks comprises storing first data and second data to be stored in a hot memory block of the memory blocks in a first buffer, transferring the first data stored in the first buffer to a second buffer to program the first data in the hot memory block, and generating RAID parity data based on the first and second data, wherein the RAID parity data and the first data form part of the same write stripe.