Dash cams use removable SD or microSD cards to store recorded data. Unlike your phone or mobile device, which stops you from adding more pictures or videos when the memory is full, a dash cam instead just uses an overwrite function to record over old data. Therefore, you shouldn’t have to worry about your dash cam shutting off because the memory card is full.  That being said, if you want to ensure that you aren’t overwriting valuable old data, you'll want to get an adequate-sized memory card, and consider the resolution at which the camera captures the video. 4K recordings take up a lot more space than 1080p recordings. We believe that the sweet spot for a memory card is somewhere around 128GB. Even if you are recording in 4K, this will allow you to record continuously for around five hours, or around 20 hours if you record at 1080p. Thankfully though, memory cards are relatively cheap and you won’t need to break the bank if you opt for even more storage capacity.