Bad purchase Cadrian. It'll work - but your data will eventually corrupt. I'm one of dozens that bought that exact same card - and because it's not SDHC, the formatting will be lost.

The only way to get a 6700 to work with a card 4 gigs or bigger - is by upgrading to WM6. Even then, you have to buy an SDHC card - not a regular SD card.

I heavily recommend returning that card, but if you don't - just make sure none of the data on the card is critical. After a lot of rewriting, the card will eventually get corrupted. This happens a lot with saving from video games.