Something happened: a break-in, an accident in the parking lot, a dispute with a customer. You go to pull the footage from your security camera system and it isn’t there. The recording was deleted, the recorder won’t boot, or the hard drive inside has failed.
Footage from a DVR or NVR can often be recovered, but these systems work against you in one important way: they never stop recording. What you do in the first hour matters more than anything else.
Why time matters so much
Most DVRs and NVRs record in a continuous loop. When the hard drive fills up, the recorder starts writing new video over the oldest footage. On a busy system with several cameras, that can happen within days, sometimes faster.
Deleted footage works the same way. When a clip is deleted, the space it used is marked as free, and the recorder will happily fill it with new video. Every minute the system keeps recording, there’s a chance it’s writing over the footage you need.
First steps
- If the recorder still works, export the footage right away. Use the recorder’s own export or backup function to copy the time range you need to a USB drive. Export a wider window than you think you need, since it’s easy to miss the exact moment.
- If the footage is missing or the recorder isn’t working, stop recording. Power down the DVR or NVR properly. Every hour it runs can overwrite more of the drive.
- Write down what you know: the date and time range, which cameras, and when you noticed the problem. Also note whether the recorder’s clock was correct, since a wrong clock is a common reason footage “can’t be found.”
- Don’t change settings or update firmware. Changing recording modes, resetting the system, or installing an update can write to the drive or wipe its index.
Why you can’t just plug the drive into a computer
It’s tempting to take the hard drive out and connect it to a PC. Here’s why that usually doesn’t work, and can make things worse:
- Proprietary file systems. Most recorders, including popular brands like Hikvision and Dahua, store video in their own formats that Windows and macOS can’t read. The drive will often look empty or “unformatted.”
- The format prompt. Windows may offer to initialize or format the drive. Don’t accept. That can overwrite the information needed to find the footage.
- Multiple drives. Larger NVRs often use two or more drives, sometimes in a RAID. Taking drives out without labelling their order can complicate recovery. See RAID Failure: What to Do First.
- A failing drive gets worse with use. Recorders run their drives 24/7 for years, and wear is common. If the drive clicks, isn’t detected, or the recorder reports a disk error, every power-on is a risk. These are the same warning signs covered in 5 Signs Your Hard Drive Is Failing.
Common situations
- Footage was deleted, or the drive was formatted. Often recoverable if the recorder was stopped quickly and the space hasn’t been reused.
- The recorder shows a disk error or “HDD abnormal.” The drive may be failing, or the recorder’s index may be damaged while the video itself is still there.
- The recorder won’t power on. The video is on the hard drive, not the recorder, so a dead recorder doesn’t mean lost footage.
- The footage is partly overwritten. Older parts of a clip may be gone while other parts survive. A professional recovery can tell you exactly what’s left.
If the footage may be used as evidence
If the video could matter for police, insurance or a legal claim, keep the original drive and recorder exactly as they are once you’ve stopped recording, and avoid experimenting with recovery software. Keep a note of who handled the equipment and when, and don’t change the recorder’s clock or settings before recovery.
Need footage recovered?
Related reading: The Dash Cam Recorded the Accident, but the Card Won’t Read
Disklab is a data recovery lab in St. Louis, on Olive Blvd. You can drop off your device or ship it to us from anywhere in the US.
Disklab recovers video from DVR and NVR hard drives, including drives from recorders that won’t boot and drives with deleted footage. After the evaluation, we’ll tell you honestly what can be recovered. Security footage missing? Start a recovery case or call us at +1 (844) 347-5522. The evaluation is free, and you pay only if we recover your data.