D600 problem

Hi,
I bought new Micro SD card (A-DATA) 512MB today. When i pluged it in there was no problem, the card was recognized. But... when i moved 4 pictures from photos to the card and tried to view them, it became realy slow. It need 5-6sec only to open the folder with pictures. And more 5-6 to open any picture. Even when i use forward button from the pad nothing happened. Hmm i am really disapointed
I haven't still try to format the card.
The other option is to return the card.
What can you advise me?
Is there any one who have same problems like me?

Thanks for help!

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all i know is i wanted that phone until the T629 came out.