How do i go about using a new card?

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I'm running baadnews hd rom with a 512mb ext partition, i have now got a new 8gb card, obviously i cant just swap cards so how do i go about setting up the new card so that i can use it in my phone??

And is there a tool that will allow me to set up a 1gb partition?

I used gparted to partition my SD card. Make sure you put the partitions in order of storage, ext and swap