My phone is nokia 7230. Hw 2 unlock memry card?

I restored my phone. Aftr restrng it is askng 4 paswrd 2 open my memry card. I didnt remembr my pasword.many important photos n mesages are in memry card. I dnt want 2 loose those. Cn u tel me hw 2 unlock it so that my al datas can b rcovrd 4m memry card safely.