1. A method, comprising: loading a boot image from a solid state drive to an operating memory of a computing system during an initialization operation of the computing system, the initialization operation initializing components of the computing system; booting the computing system based on the boot image loaded on the operating memory upon completion of the initialization operation, wherein the operating memory are coupled to a processor of the computing system which is initialized during the initialization operation, wherein the solid state drive includes a plurality of nonvolatile memories configured to store the boot image, a buffer memory and a controller configured to control the plurality of nonvolatile memories and the buffer memory; and loading a code from the plurality of nonvolatile memories to the buffer memory before loading of the boot image, wherein the loading of the boot image is performed using the code loaded in the buffer memory.