hi,
i bought a sd module, but i can't find on internet a simple sketch to plug it on my arduino uno. Is there someone that can show me a simple sketch? My module is this:
thank you 
You can find your pins here:
You might not be able to get that to work as they used very poor voltage translation 5 to 3.3 levels.
LarryD is correct. (Thanks for correcting my oversight) You might need a Logic Level Converter such as http://www.sparkfun.com/products/11978
This topic may be helpful: http://www.element14.com/community/thread/15572?start=0&tstart=0
LarryD i'can't understand what you say. My module has two pin, one for 5v e another for 3.3v, what is the correct pin to plug my module to arduino uno??
I think you should use a different style PCB. The PCB you have is poor quality.
Use something like this:
bors26:
what is the correct pin to plug my module to arduino uno??
You need to plug the 5v pin into the Arduino Uno. Use the 3.3v pin to power the low voltage side of the logic level converter.
Don't connect the MOSI, SCK, and CS pins directly to the SD Card breakout, as you risk damaging the card. You'll need a logic level converter or level shifter to protect the SD.