SD card choosing

Hello, this is my first post. Anyway I need a SD card of MicroSD card that can read and write. I found some that read but don't write and some that have libraries for them.(I am using the Arduino Mega.) Can some one direct me to a breakout board?

Thank you.

I mean the libraries are not made to do that. And i do not know how to make a library for a sd card.

Try library named 'FAT16'.

This thread refs a working addon card for sd. http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1266255682

Please don't think we are short with you, but I have seen this topic posted 1 hr after someone asked the exact same question.

What would be the best hardware for this?