I noticed that the article from phonescoop.com states that...
"The Storm comes with 1 GB of built-in memory plus another 8GB on the included memory card. Cards up to 16 GB are officially supported, and it should handle 32 GB cards in theory."
Actually it's the OS version of any BB that determines the size of the media card. From what I've read, the Storm's OS version (4.7) will handle a 16GB media card.