SD card

I was bugging my husband to buy me an extra sd card for my laptop. I have quite a collection of pictures already downloaded to the lap top's picture file and I don't want to add some more since it slows down the computer. I'd rather save the pictures on the SD card to save more of the computer's memory. But I'm glad when we went to the store the other day and bought the 4GB SD card because lately I been adding more video files on it. It's very useful.