FSIZE
#define FSIZE 256*1024*1024
#define FSIZE (64 * (CLUSTERSIZE)) //FSIZE may range from NUM_CHUNKS clusters to 8GB
#define FSIZE (512 * (CLUSTERSIZE)) //FSIZE may range from NUM_CHUNKS clusters to 8GB
#define FSIZE (size_t)(2 * 1024 * 1024)