13 euros for a Class 4 card unusable it is expensive (We find Class 10 cards (faster write access) for less than 8.00 Noobs ... Knowing that is free, a Kingston 8GB Class 4 card must return to less than 3.00 to the dealer (sold with 4.55 margin on Amazon) it makes margin 9.00 for the same thing not formatted correctly!
Tips, buy a card directly 8GB Class 10 (less than 8.00) and download the Noobs solution (free on site RaspberryPi). Format the card with the "Format Card Adjustment" option to ON and do a simple copy and paste, you will have earned 5 euros ... and time!