A dash cam records continuously until storage is full, then overwrites old footage.
Dash cams typically record in a loop, continuously capturing video until the memory card reaches capacity. Once full, the device automatically overwrites the oldest files to make space for new recordings. The total recording duration depends on the memory card size, video resolution, and compression settings.
Factors affecting recording duration
- Memory card capacity (GB)
- Video resolution (720p, 1080p, 4K)
- Frame rate (30fps, 60fps)
- Compression format (H.264, H.265)
- Continuous vs motion-activated recording
Recording time by memory card size
| Memory Card | 1080p @ 30fps | 1440p @ 30fps | 4K @ 30fps |
|---|---|---|---|
| 32GB | 4-6 hours | 3-4 hours | 2-3 hours |
| 64GB | 8-10 hours | 6-8 hours | 4-6 hours |
| 128GB | 16-20 hours | 12-16 hours | 8-12 hours |
| 256GB | 32-40 hours | 24-32 hours | 16-24 hours |
Loop recording vs incident recording
Most dash cams use loop recording, where continuous footage is divided into segments (usually 3-5 minutes). When the card fills up, the oldest segment is deleted. Incident recording locks current and nearby segments when the G-sensor detects a collision, preventing them from being overwritten.
Extending recording time
- Use larger capacity memory cards (up to 256GB for most models)
- Lower video resolution settings
- Enable motion detection in parking mode
- Regularly transfer important footage to another device