How to connect sd card in arduino mega 2560?

Question

Arduino

Good afternoon.
Here's a handkerchief came: www.buyincoins.com/item/9032.html
I've been fighting for the second day!
Connection is like this:

5v -> 5v
cs -> 53
mosi -> 51
sck -> 52
miso -> 50

And code:

#include <SD.h>

File myFile;

void setup()
{
 // Open serial communications and wait for port to open:
  Serial.begin(9600);
   while (!Serial) {
    ; // wait for serial port to connect. Needed for Leonardo only
  }

  Serial.print("Initializing SD card...");
   pinMode(53, OUTPUT);
   
  if (!SD.begin(53)) {
    Serial.println("initialization failed!");
    return;
  }
  Serial.println("initialization done.");
  myFile = SD.open("test.txt", FILE_WRITE);
  
  if (myFile) {
    Serial.print("Writing to test.txt...");
    myFile.println("testing 1, 2, 3.");
  // close the file:
    myFile.close();
    Serial.println("done.");
  } else {
    // if the file didn't open, print an error:
    Serial.println("error opening test.txt");
  }
  
  // re-open the file for reading:
  myFile = SD.open("test.txt");
  if (myFile) {
    Serial.println("test.txt:");
    
    // read from the file until there's nothing else in it:
    while (myFile.available()) {
    	Serial.write(myFile.read());
    }
    // close the file:
    myFile.close();
  } else {
  	// if the file didn't open, print an error:
    Serial.println("error opening test.txt");
  }
}
void loop(){ }

The process actually stops at "initialization failed!".

Answer 1

The mod was bad. Collected according to the scheme from the Internet and it all worked. SD and SDHC. They say that MMS is also supported, but I managed to parse it :)

Answer 2

Try using an SD card - not MMC, not SDHC.
, but this one is not

Answer 3

You have an MMC card, not an SD card . Although they are the same size, they are a completely different type of card, they even have different connectors. Naturally, it won't work.
You need a card that says SD or SDHC, like the ones shown in the first answer.