Your dashcam is running every time you drive, and it never really stops. But no memory card is big enough to hold months of footage. What loop recording means is simple. Your dashcam records over its oldest footage once the card fills up. It keeps recording without ever running out of space.
What Does Loop Recording Mean?
Loop recording means your dashcam automatically overwrites its oldest footage once the memory card is full, instead of stopping. It splits your drive into short segments, usually 1 to 5 minutes each, and keeps cycling through them. This way, the newest clip always has room.
You never have to sit and delete old files yourself. The camera manages its own storage in the background, for as long as it has power.
How Loop Recording Works
Think of the SD card as a loop rather than one long tape. Instead of saving your whole day as a single giant file, the dashcam breaks it into fixed length clips, typically 1, 3, or 5 minutes.
Recording in segments matters for two reasons. Shorter files are easier to find and export when you need one specific moment, and if a single file gets corrupted, you only lose that clip and not the whole day's driving.
Once the card fills up, the dashcam looks for the oldest segment and writes over it first. This repeats on its own, over and over, for as long as the camera is on.
Does Loop Recording Delete Footage I Need?
No, not if your dashcam's G sensor is doing its job. Loop recording only overwrites normal, unprotected footage. The moment it detects a hard brake, a collision, or a sudden jolt, the dashcam locks that clip into a separate protected folder.
Locked clips are not part of the loop at all. They sit outside it, safe, no matter how many times the rest of the card gets overwritten. They stay there until you delete them yourself or move them off the card.
The real risk is not loop recording itself. It is driving with the G sensor switched off, or set too low to catch a genuine impact. Keep it on at a sensible level, and the footage that matters will still be there when you go looking for it.
How Loop Recording and the G Sensor Protect Your Crash Clip
A G sensor is a small internal sensor that detects sudden changes in motion, like hard braking, a pothole, or an actual collision. Loop recording and the G sensor are built to work together, not as two separate features you have to manage on your own.
When the G sensor triggers, two things happen at once. The dashcam keeps looping normally through the rest of the card. At the same time, it locks the clip covering the event. That locked clip never enters the loop at all.
This is also why sensor sensitivity matters. Set it too high, and ordinary bumps get locked and quietly eat into your free storage. Set it too low, and it may miss the one moment you actually needed protected.
What SD Card Size Do You Need for Loop Recording?
A bigger card does not change how loop recording works, but it changes how far back your loop stretches before the oldest footage gets overwritten. Here is roughly what to expect, depending on how many channels you are recording:
|
Card Size |
1 Channel (Front Only) |
2 Channels (Front + Rear) |
3 Channels (Front + Rear + Cabin) |
|
32GB |
2 to 4 hours |
1 to 2 hours |
0.5 to 1 hour |
|
64 GB |
4 to 8 hours |
2 to 4 hours |
1 to 2 hours |
|
128GB |
8 to 16 hours |
4 to 8 hours |
2 to 4 hours |
|
256GB |
16 to 32 hours |
8 to 16 hours |
4 to 8 hours |
For the full breakdown on choosing the right card — speed class, endurance, and which size fits your model — see our best memory card for a dashcam guide.
Figures are approximate and depend on resolution and bitrate settings. 256GB is currently the maximum card size supported.
If you run a 3 channel setup like the X900 TriVision, the same card holds less driving time than it would on a single channel dashcam, since all three streams are writing to one card at once.
Because loop recording means constant rewriting of the same card, not every card holds up equally well. Standard cards are built for occasional use, not thousands of overwrite cycles. The SD Association rates memory cards for sustained continuous recording performance, and checking a card's speed class rating before fitting it into a dashcam is worth the extra minute.
Every nextro dashcam, from the X300 SoloView to the X900 TriVision, runs loop recording with automatic G sensor lock built in.
If you are still deciding which dashcam to buy, our complete dashcam buying guide covers the features that matter most on Indian roads.
About the author
Bhavesh Kumar, Head of Product & Customer Success at nextro. He works directly with customers on dashcam setup, footage recovery, and insurance claims — including the cases where footage went missing because an unprotected clip was overwritten. He writes about what actually holds up in Indian driving conditions.
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