#include <SD.h>
#include <SPI.h>

void setup(){
  SPI.setClockDivider(SPI_CLOCK_DIV4);
  Serial.begin(9600);
  pinMode(10, OUTPUT);
  SD.begin(4);

  SD.remove("myFile.bin");

  File myFile = SD.open("myFile.bin", FILE_WRITE);
  if(! myFile){
    Serial.println("Failed to open file for writing");
    return;
  }
  byte * data = new byte[128];
  for(int a = 0; a < 128; a++){
    data[a] = 0x00;
  }
  
  long start = millis();
  for(unsigned long a = 0; a < 1024L * 8L * 1L; a++){
    myFile.write(data, 128);
  }
  long ending = millis();
  myFile.close();
  
  Serial.print("Took ");
  Serial.print((ending - start) / 1000);
  Serial.println(" seconds to write the data");

}

void loop(){

}