Your dash cam may have captured exactly what happened in a crash, a hit-and-run or a break-in, and that footage can matter to your insurance claim. The trouble is that a dash cam is built to throw old video away. If it keeps running, or the card has been damaged, the clip you need can disappear within hours. Once everyone is safe and you’ve dealt with the immediate situation, saving the footage should be near the top of your list. Here is how to protect it, and what to do if the card won’t cooperate.
Why the clock is ticking
Most dash cams use loop recording. They record in short clips and, when the memory card fills up, they overwrite the oldest clips to make room. How long you have depends on the size of the card, the video quality and whether the camera has more than one channel. A small card recording in high resolution can cycle through in a few hours of driving.
Many cameras have a G-sensor that detects an impact and locks the current clip, moving it to a protected folder, often named something like EVENT or RO. That helps, but don’t rely on it:
- A low-speed bump may not trigger the sensor.
- On many models, the protected area has limited space, and older locked clips can be replaced by new ones once it fills.
- Potholes and speed bumps can fill that area with useless clips.
- Parking mode can keep recording while the car sits, which uses up the card even after the crash.
What to do right away
- Stop the recording. Press the event or emergency button if your camera has one, then turn the camera off. Hardwired cameras may keep running with the ignition off, so check that the screen or status light has actually gone out.
- Take out the memory card once the camera is off. Removing it during a write can damage the clip being recorded.
- Keep the card safe. Put it in a labeled case or envelope. Don’t leave it in the car, and don’t put it back in the camera.
- Don’t drive with the camera recording onto that card. If you need a camera on the road, use a different card.
- Make a note of the date and time of the incident, and whether the camera’s clock is accurate. Clips are easier to find if you know what you’re looking for.
Copying the footage
Put the card into a computer using a card reader. Copy the whole card, including every folder, to the computer before you try to view anything. Keep the original files exactly as they are, without renaming, trimming or converting them, and work only from a second copy. Your insurance company, attorney or the police may ask for the original files, so it’s worth asking what they need before sending anything. Leave the card itself untouched until the claim is settled.
Some cameras also offer a phone app over Wi-Fi or a cloud service. If yours does, check it, since an event clip may already have uploaded. Don’t assume it’s the full-quality version, though. Keep the card regardless.
Laws on recording, including audio, and on windshield mounting vary from state to state. If the footage is part of a legal dispute, your attorney is the right person to advise you on how to handle it.
If the clip is missing or won’t play
A few problems come up often:
- The last clip won’t open. If the crash cut the power, the camera may not have finished writing the file. The video data may still be there even though the file won’t open, so keep the original and don’t run repair tools on your only copy.
- The camera says “card error” or asks you to format. Decline. Formatting clears the card’s file system. Dash cams wear cards out with constant writing, and a card can fail at any time.
- Windows offers to “scan and fix” the card. Decline that as well, as it writes to the card.
- The clip isn’t in the folder. Check the protected folder as well as the normal one, and check the camera’s clock, since the clip may be filed under the wrong date.
- The card or camera was physically damaged. Don’t try to force a bent or cracked card into a reader. A damaged camera may have left the card intact, so remove it carefully. Some cameras store video in built-in memory, and in that case keep the whole unit and don’t try to charge it or power it up repeatedly.
What recovery can and can’t do
We’d rather be upfront about this: footage that has been overwritten is gone, and no service can bring it back. Because dash cams write constantly, how much is recoverable depends heavily on how soon the camera was stopped. The sooner the card is out of the camera, the better your chances.
Where the video is still physically on the card, there’s often more to work with. Corrupted file systems, accidental formats and failed cards can sometimes be recovered, although a loop-recorded card can be fragmented and clips may come back only in part. A failed microSD card may need specialist work on the card itself.
If you try recovery software, use it only on a card that’s reading normally, save anything it finds to a different drive and stop if the card disconnects. Our USB and memory card recovery page explains how we deal with these cards. Our engineer evaluates the card and gives you a fixed quote, recovery starts only when you approve it, and we work from a copy rather than the original.
Set yourself up for next time
- Use a high-endurance memory card made for continuous recording.
- Choose a larger card to give yourself more time before overwriting begins.
- Check the card from time to time by pulling and playing a recent clip.
- Replace the card on the schedule your camera’s maker recommends, or sooner if errors appear.
- Keep the camera’s date and time correct.
Need footage off a failed card?
Keep the card out of the camera and call Data Retrieval at (213) 986-4855. We serve Los Angeles, the Inland Empire and Ventura County, and we accept mail-in recoveries from anywhere in the US.