Supercard SD Problems

Due to the lack of space on my 1GB SD, I bought a 4GB SanDisk SD card so I could fit a couple of hours of Sealab on it. To my suprise it didn't run when I clicked it into my Supercard. Apparently very few brands of 4Gb card work with Supercards.
Is there anything I can do to fix the problem? If not, what brand SD Card should I get instead for 4Gbs?

Also, slightly unrelated, is it worth me sticking FlashMe on my DS even though I've already got a SuperKey?

Any replies would be very much appreciated.

You'd want the non-SDHC cards, which are kinda hard to find. Read the Wikipedia article on Secure Digital for some more info on what SDHC is. A 2 GB card shouldn't have the issue.

FlashMe allows you to leave the Superkey at home, which I find useful, as I can have a regular DS game in there at all times. For instance, I usually leave my Opera DS cartridge in there so that I only have to swap 1 cart when I want to use it.

Wicked, cheers for the help. I may just settle fot 2Gb instead.