blackberry pearl media card.

I just bought a micro scan disc for my blackberry pearl media card....
and in my settings it only gives me an option of MEfMORY ...so in that option i am able to format or INSERT media card....both options i have chose but did not work.
I also have tried to format on my computer...that worked...but as soon as i return the media card to my phone...it reads : VERIFY that the media card is formatted...
what do I do now???