How I get 100 hz frequency in arduino mega 2560

[johnwasser]

@himanshu123

for (int i =0; i<=100; i++){   
    dataFile.print(dataString );
    dataFile.print(',');
    dataFile.print(dataStringA);
    dataFile.print(',');
    dataFile.print(dataStringB);
    dataFile.print(',');
    dataFile.print(dataStringC);
    dataFile.print(',');
    dataFile.println(dataStringD);
    dataFile.close();
  }

WHY are you writing the same data 101 times?!?