I use a Viofo in my current Jeep and haven't had to format the storage, the oldest recording gets overwritten first, we have recently placed an order for a new Kia Sportage and when it arrives in about 4-5 months I will install the latest A299 pro model which are available in 1,2 or 3 channel. They aren't too bad price wise and they have had quite good reviews on the web from sites that specialize in dash cams. Might be worth your while to check them out.