A method of recording/reproducing data on a storage medium. The method includes decoding a radio frequency (RF) signal read from the storage medium into corresponding binary data; storing the binary data in an external memory connected with a host interface through which a host inputs an instruction to read data from the storage medium; and storing data read from the external memory in an internal memory and performing ECC error correction on the data, wherein the internal memory is directly connected to an ECC unit that performs ECC error correction and has a data storage capacity of one ECC block.