protected Integer calcDataSecCnt() {        
        int TotSec;
        if (BPB_TotSec16 != 0) {
            TotSec = BPB_TotSec16;
        } else {
            TotSec = BPB_TotSec32;
        }
        dataSecCnt = TotSec - (BPB_ReservedSecCnt - (BPB_NumFATs * FATSz) + RootDirSectors);
        System.out.println("DataSecCnt = " + dataSecCnt);
        return dataSecCnt;
    }