def truncae(self, pgno, maximumSize):
        buffer = [0]*maximumSize
        limit = 1024
        count = 0
        # opens the file for read and append
        f = open("F:/labOS/funner.dat", "r+")
        if f:
            # moves the pointer
            f.seek(pgno*1024+maximumSize)
            # instead of trimming the file it actually overwrites the file with empty spaces
            for i in range(limit):
                buffer[count] = " "
                f.write(str(buffer[count]))
        f.close()