1. A method of managing a solid state drive, the solid state drive including one or more memory cell arrays divided into a plurality of blocks, a first portion of the blocks designated for storing user data and a second portion of the blocks being designated as reserved blocks for replacing defective blocks in the first portion, the method comprising: performing, by a memory controller, one of at least one read operation and at least one write operation through a plurality of channels with respect to the first portion; and selectively reformatting, by the memory controller, the solid state drive to convert one or more blocks in the first portion into reserved blocks.