It dumps to the SD card after 5 mins of shooting. The transition between clips is frame accurate and they go back together perfectly on post. I at first, I found it weird but now use it to my advantage and think on 5 min sequences and may wait on a camera change until I finish a clip. I have had weird moments where it made a ten minute clips but I've never figured out why. It helps a lot when you shoot in 4K.5 minute limit. The creates new file.
exactly why I said 5 minute chunks are a positive thing. When doing an edit I rarely take anything more than a minutes worth from the chunk and, for my recreational videos, I rarely produce anything more than 4 minutes long.If you find anyone still awake or attentive after 4 minutes of video you will have found a rare one. Unless making a full on movie try keeping videos to 3 minutes or less. The 5 minute clips actually make scene selections a little easier since you don't have to wade through a longer clip to find them.