We bought 2 of these and put them out about 4 weeks back. We have 4, 4 gig SD cards so all we have to do is pop one card out and another back in. We check them about once every week and a half. Lots of traffic through but for some reason after trying to switch one of them to video mode to check some directions of travel, lots of the videos randomly wont play.
If you have use those card previously in another device, as mentioned, they will have to be reformatted. I always keep my cards seperate, I never use them in anything else and I don't mix them between cameras. Hope this helps.
Blessings.....Pastorjim
__________________
Mere religion is just hanging around the cross.......True Christianity is getting on the cross.