information of clusters corresponding to a file file_ 1 in particular the file system may read a fat entry of a second cluster as an initial cluster to search a fat entry a hint information area of each of four searched fat entries may include vvd here 0xa 0xb 0xc and 0xd may be vvd recorded in respective hint information areas of fat entries each corresponding to second third fourth and fifth clusters respectively vvd entries 0xa 0xb 0xc and 0xd are exemplary and may be changed as needed the file system may check whether clusters of the file file_ 1 are formed by a fat entry according to an embodiment if the verification is completed the file system may shift to a tenth fat entry a fat entry corresponding to a tenth cluster based upon cluster status information or linked information recorded in a fat entry corresponding to a fifth entry for example hint information of 4 is recorded in a hint information area of a fat entry corresponding to the tenth cluster the number of the hint information area indicates validity verify data or the number of clusters or a cluster chain number continuously allotted from a current cluster the number.