Arduino UNO + SD card module -> re-open file for reading error

Hello,

I’m having a problem with read SD card.

Platform Arduino Uno + SD module
13 - SCK
12 - MISO
11 - MOSI
10 - CS
+5V
GND

Card - SD 1GB Kingston, Fat16.

Code from EXAMPLES/ReadWrite library SdFat.

#define SD_CS_PIN SS
#include <SPI.h>
//#include <SD.h>
#include <SdFat.h>
SdFat SD;

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...");
  // On the Ethernet Shield, CS is pin 4. It's set as an output by default.
  // Note that even if it's not used as the CS pin, the hardware SS pin
  // (10 on most Arduino boards, 53 on the Mega) must be left as an output
  // or the SD library functions will not work.
  pinMode(10, OUTPUT);

  if (!SD.begin(SD_CS_PIN)) {
    Serial.println("initialization failed!");
    return;
  }
  Serial.println("initialization done.");

  // open the file. note that only one file can be open at a time,
  // so you have to close this one before opening another.
  myFile = SD.open("test.txt", FILE_WRITE);

  // if the file opened okay, write to it:
  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()
{
  // nothing happens after setup
}

After compilation message from Arduino Serial Monitor:

Initializing SD card…initialization done.
Writing to test.txt…done.
error opening test.txt

File is created OK, there is inside “1,2,3”.
I cannot open again this file.

I have tried change 5V to 3.3V, change CS pin to 4, different SD card, but problem is still the same.

Can anyone help?

Cheers.