The emergence of drones not only expands the limitations of shooting, but also reduces the cost of shooting. At present, we can see the figure of drones in various fields, bringing a new problem while the popularity of drones---data security! The data security here does not refer to the transmission link, but when the terminal receives it. Data security when the drone returns data. Because the drone is still human operation, it inevitably brings about the problem of data loss caused by human error, such as accidental deletion of data, damage to the storage medium, data loss or video file failure. ......
Many flying hands often complain to us that "the schedule is basically full. When you fly one, you will fly another one. Multiple data will be collected and sorted out. Sometimes it is really easy to make mistakes!"
After reviewing the recovery cases of such unmanned aerial vehicles, the CHS data recovery laboratory found that nearly 85% of the data loss was caused by human error, which is high in proportion.
If you delete it, you need to recover. This seems to be a matter of course. Many people may think that this is a very simple matter. Anyone who finds a recovery software on the Internet will be restored. This is true for ordinary files. This method can't work for drones. It only wastes time. Why? We use a video file generated by a UAV as an example to explain (source sample is DJ4- Pro+), below is the storage parameter
Storage device: 64G high speed card
File system: exfat
Reason for data loss: misformatting
Features: Dajiang UAV will generate two files with the same name when generating video files, one of which is MP4 and one of which is MOV. One of these two files is for "small video" for preview using highly compressed video (audio ) coding; the other one is the real high-definition video, a group of two large and one files of the same name.
As shown in the figure above: Since a group or even multiple sets of video are simultaneously played during transmission (theoretically, it is queued for writing, but this speed is already very fast, giving the impression that it is synchronous), this time the size of two The video file produces cross-storage, which is “fragmentationâ€. The above picture shows a small video for DJ preview. The number of fragments has reached 54. This is still a preview video with a capacity of only 40 M. The number of file fragments on G, such as 4G, is likely to reach thousands or even tens of thousands!
Ordinary recovery software will only find the file header to locate the file when recovering. If there is fragmentation, the recovered data must be invalid.
The DJ's fragmented crossover storage has extremely difficult technical problems for fragmentation and separation. There is no corresponding professional recovery tool on the market. After continuous research, the engineers of CHS data recovery laboratory got the underlying video coding structure of DJ drone and developed a fragment reassembly program, which can not only accurately locate HD video fragments but also reorganize them. Even files that cannot be played by the video due to the crash can be effectively repaired.
Here we briefly introduce the recovery method of the UAV in Dajiang. First, run the CHS data recovery studio to develop the DUA video recovery program and select the storage to be restored, as shown below:
Right click to start scanning, and then wait for the scan result, the program will automatically locate the HD video frame of the DJI UAV and automatically separate the cross-shards. There is no need for human intervention in the middle, waiting for completion!
The effect of fragment reorganization is as shown in the figure below. You can see that all the videos have been successfully reorganized. All the results will show the shooting date for easy query. At the same time, the reorganization file will be evaluated hierarchically. The icon is green and the effect is the best!
As shown below, you can see that the program successfully restored the video around 45G.
Partial recovery video
At the same time, the video can not be played for accidents such as drone crashes. The engineers of the CHS data recovery laboratory can also completely repair from the underlying code. The restored video resolution and the main frame, sub-frame and original video are the same!
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