The content or video is compressed with h.264. The memory card is the storage and not much else.
The only issue I ever encounter is that the card must be within the supported sizes. My advice is simple. Get one of the same size and and try it. There are some that can't do their own support such as find a menu to format the card in the recorder so we do that for them and charge a little for them.
I'm not sure where to post this so i guess i'll put it here. I run a dispatch office for a school bus company and we recently installed fortress mobile video cameras on some of our buses. The SD cards are compressed with the h.264 compression and i need to purchase some extra cards. I spoke with fortress mobile and the price of the cards from them is a heck of a lot more than the price on amazon. For the last 2 days I've been trying to figure out if there is a program that i can download that will give me the h.264 compression, but no luck. I started thinking that maybe it doesn't need to be compressed to that format, maybe it comes that way already when you purchase it??? Any help would be greatly appreciated i would like to save the company i work for some money if at all possible.