I have multiple SD cards that I want use while out filming but do I need to put the firmware file on each card I want to use?      Lately when I upload my video files to my computer every movie creates 2 files, one for the video and the other is a .sdk which I think is somthing to do with audio (which the P3 does not have) any ideas how to turn this feature off?

You don't need to have the firmware on the SD cards. Not sure what the SDK files are.

You can now buy the official DJI Hardshell Backpack for the Phantom 3

Remember to buy extra propellers and one or two spare batteries to keep you flying

www.Phantom-Guide.co.uk - The Ultimate Phantom 3 Resource

Thanks that's good! Now I just need to figure out about the other file type?