• Communication : SD SPI ( MOSI, SCK, MISO and CS )
• DC Input : 5V/3.3V
• Size : 5.1cm x 3.1cm - 2.01inch x 1.22inch. 

SD Card Pinouts:

Reader           Uno      Mega

1. GND
2. 3.3Vcc
3. +5Vcc
4. CS                   10    10
5. MOSI                     11    51
6. SCK                        13    52
7. MISO                     12     50
8. GND

Arduino SD Card SD Card Module Slot Socket Reader Tutorial

Format Your SD Card

You will need an SD Card. The format that SD Card using Windows to a FAT32 volume.

Connect the Arduino SD Card Module to your Arduino

as you saw in the pinout section above please connect the module accordingly you can connect the module to the VCC using 3.3 or 5 volts the 5 volts is connected on the module using an onboard regulator

Simple code to be sure that the SD card Reader is working:

#include
#include
int cs = 10; // Set chip Select to pin ten
void setup()
{
 // Open serial communications and wait for port to open:
 Serial.begin(9600);
 while (!Serial) {
 }
 Serial.println("Initializing SD card...");
 Serial.println();
 pinMode(cs, OUTPUT);
 // Documentation says you're supposed to do this
 // even if you don't use it:
 pinMode(SS, OUTPUT);
 // see if the card is present and can be initialized:
 if (!SD.begin(cs)) {
 Serial.println("SD did not initiliaze");
 while (1) ;
 }
 Serial.println("SD initialized.");
}
void loop()
{
}