BLACKBERRY OS VERSION
Media Card Size Limit
BlackBerry Device Software 4.2.0 Up to 2GB
BlackBerry Device Software 4.2.1 Up to 4GB
BlackBerry Device Software 4.2.2 Up to 4GB
BlackBerry Device Software 4.3.0 Up to 8GB
BlackBerry Device Software 4.5.0 Up to 8GB
BlackBerry Device Software 4.5.0.81 and Up Up to 16GB
BlackBerry Device Software 4.6.0 Up to 16GB
I don't know of any PDA that has a media card slot capable of more than the most basic data transfer speed. If you use the same card in a good digital camera the speed difference will become very noticable.
Posted from my CrackBerry at wapforums.crackberry.com