Don't Format SD cards with OS utilities!

Using Arduino Storage
16

effing board restriction to 9000 chars does not allow to post complete code.
Code runs on a DUE at most possible speed for the TFT (ILI9341_due lib, SPI clock up to 84 MHz),
for the SD card I didn't alter anything of the pre-settings.

SD cards are from Transcent, 1GB / 16GB, class 10.

#include <SPI.h>

#include <SdFat.h>
SdFat SD;

//#include <SD.h>


// **SNIP**

#define fileIO_OK            +1
#define fileIO_NO_ERR         0
#define fileIO_ERR_CREATE    -1
#define fileIO_ERR_OPEN      -2
#define fileIO_ERR_REMOVE    -3
#define fileIO_ERR_WRITE     -4
#define fileIO_ERR_READ      -5
#define fileIO_ERR_IMPLAUS   -6
#define fileIO_ERR_NAME      -8
#define fileIO_ERR_SDCARD   -16


//=====================================================================================
// SD init
//=====================================================================================


int16_t initSD() {
   char sbuf[128];
   uint32_t  tstamp;
   int16_t   ior=0;
  
   tstamp = clock();
   ior=SD.begin(sd_cs);  // 1==true on success; else 0==false
   while( !ior) {      
      sprintf(sbuf, "#: ...SD not found... ");  
      curlf(); lcdprint("#: ...SD not found... "); 
      Serial.println(sbuf);
      delay(1000);   
      ior=SD.begin(sd_cs);
      if (clock()-tstamp>20000) {Serial.println("#: ...break!"); break; }
   } 
  if(!ior) return fileIO_ERR_SDCARD;     // SD ioresult==0 => error = -16 
  return fileIO_OK ;                     // SD ioresult==1 => ok = 1
} 





//=====================================================================================

void setup() {
   char sbuf[128];   
   int32_t  i=0;
         
   // Serial terminal window
   i=115200;
   Serial.begin(i);  
   Serial.print("Serial started, baud="); Serial.println(i);
   
   
   // TFT LCD
   Serial.println();
   LCDTYPE = _ILI9341_;
   Serial.print("init LCD..."); 

   initLCD(1);   

   Serial.println(" done.");   lcdcls();
   sprintf(sbuf, "LCD=%d wi%dxhi%d Font %dx%d",LCDTYPE,LCDmaxX,LCDmaxY,fontwi,fonthi);
   Serial.println(sbuf); 
   Serial.println();
   lcdcls(); lcdprint(sbuf);
   
   // SD card
   sprintf(sbuf, "SD init... ");   Serial.println(sbuf);
   i = initSD();
   if(i==fileIO_ERR_SDCARD) sprintf(sbuf, "SD failed! ERROR ! ");  
   else sprintf(sbuf, "SD OK ! ");   
   Serial.println(sbuf);   
   curlf();  lcdprint(sbuf);
   
   sprintf(sbuf, "setup(): done.");
   Serial.println(); Serial.println(sbuf);   
   curlf(); curlf(); lcdprint(sbuf);
}



//=====================================================================================
void loop(){
   char     sbuf[128];
  
   

}