public void calcThisFATEntOffset(int N) {
        int FATOffset = 0;
        if (typeOfFileSystem.equalsIgnoreCase("FAT16")) {
            FATOffset = N * 2;
        } else if (typeOfFileSystem.equalsIgnoreCase("FAT32")) {
            FATOffset = N * 4;
        }
        thisFATSecNum = BPB_ReservedSecCnt + (FATOffset / BPB_BytsPerSec);
        thisFATEntOffset = FATOffset % BPB_BytsPerSec;
    }