LPC2148 SD interface WITHOUT USING fclose()

Hi I have added my code I am using global variables but its simple to understand , also i put the command on each line.
My code working perfect with using fclose(); but without it it cant work it create a file on path and take time for writing but nothing in the file.

void Update_Log(void)
{
        CString l_File_Path;

        FILE *fRace_Log;

         SIM_PORT_TOG_1(); //Toggling the input pin

        /* Getting RTC */
        Get_Real_Time(); // RTC will be updated automatically in processes

        l_File_Path = FUN_SDC_Get_File_Path(C_File_Type_Race);

        /* Opening Log files initially */

        SIM_PORT_TOG_5();
        fRace_Log = fopen(l_File_Path, "a+");
        SIM_PORT_TOG_5();

        /* Writing to the file as recommended by the customer */
        {
                SIM_PORT_TOG_3();

                /* Logging Date */
                fprintf(fRace_Log,sDateLogFormat,vDateLogFormat);//Updating Date
                fprintf(fRace_Log,sRaceLogDelimiter);

                /* Logging Time */
                fprintf(fRace_Log,sTimeLogFormat,vTimeLogFormat);//Updating Time
                fprintf(fRace_Log,sRaceLogDelimiter);

                fprintf(fRace_Log,"\n");

                SIM_PORT_TOG_3();//Toggling 3rd pin
        }

        SIM_PORT_TOG_4();
//      fclose(fRace_Log);//It takes too time
        SIM_PORT_TOG_4();

        SIM_PORT_TOG_1();
}

Hi I have added my code I am using global variables but its simple to understand , also i put the command on each line.
My code working perfect with using fclose(); but without it it cant work it create a file on path and take time for writing but nothing in the file.

void Update_Log(void)
{
        CString l_File_Path;

        FILE *fRace_Log;

         SIM_PORT_TOG_1(); //Toggling the input pin

        /* Getting RTC */
        Get_Real_Time(); // RTC will be updated automatically in processes

        l_File_Path = FUN_SDC_Get_File_Path(C_File_Type_Race);

        /* Opening Log files initially */

        SIM_PORT_TOG_5();
        fRace_Log = fopen(l_File_Path, "a+");
        SIM_PORT_TOG_5();

        /* Writing to the file as recommended by the customer */
        {
                SIM_PORT_TOG_3();

                /* Logging Date */
                fprintf(fRace_Log,sDateLogFormat,vDateLogFormat);//Updating Date
                fprintf(fRace_Log,sRaceLogDelimiter);

                /* Logging Time */
                fprintf(fRace_Log,sTimeLogFormat,vTimeLogFormat);//Updating Time
                fprintf(fRace_Log,sRaceLogDelimiter);

                fprintf(fRace_Log,"\n");

                SIM_PORT_TOG_3();//Toggling 3rd pin
        }

        SIM_PORT_TOG_4();
//      fclose(fRace_Log);//It takes too time
        SIM_PORT_TOG_4();

        SIM_PORT_TOG_1();
}

Note that small writes seldom actually result in a real write - the data just gets cached. So when enough new data arrives or the program makes a fclose(), you finally get the data written to disk. Next thing here is that fclose() should do more than just write the file data - it should finalize disk allocation mappings and the directory entry too.

So your microseconds for the write isn't really the time for the write to memory card but the time for buffering your data pending a later flush of data to the memory card.

In some situations, it's possible to break up the program into one part that handles the memory card writes, and another part that runs the normal business logic. So the program can continue to do whatever should be done while the file writes are allowed to take whatever time they need in the background. In some situations, it can be meaningful to add some other memory technology, like FRAM, for instant buffering of data. And then "formalize" the data into a standard file system at a different time.