Some cameras opt for hard-wired internal storage, like the Miofive 4K. There are often bundles available with the card. Some come with larger cards, and some budget models come without. Incident recording triggered by impact (G) sensors, or when in parking mode (see below), by motion detection.The camera should have a setting that allows you to specify how long the camera runs off 12-volt before shutting down. This requires a battery or large super-capacitor (see below in “Power connections”). Self-powered recording when power fails, so that you can be sure to capture all of an incident.It’s handy for those managing fleets of vehicles, too, as incident videos are safely stashed online. Uploading to the cloud in real time is a nice hedge against damage and theft-assuming the thief isn’t smart enough to kill the dash cam immediately. Cloud storage is available with a few dash cams.Most dash cams will overwrite older recordings when they run out of space. Video is saved (protected from overwriting) automatically when an incident is detected. Video is recorded, then immediately overwritten at a specified interval unless saved. Continuous loop recording to minimize storage requirements.Don’t avoid 4K UHD-which is a feature in our best overall picks-but read the reviews first so you know whether the cost is justified. For most purposes,1080p is the more frugal everyday choice. In our tests, the gain in detail from 4K video (2160p) can vary, but the storage investment is consistently heavy: four times the storage of 1080p, or around 1GB for every three minutes of video.
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