Why can the 8g memory card of the driving recorder only record for 20 minutes?

How long the driving recorder can record depends on the capacity of the memory card in the driving recorder and the quality of the recorded image. If the recorded image quality is 720P, the 8g memory card can record continuously for 5-6 hours.

If the memory card of the driving recorder can only record for 20 minutes, it is likely that the memory card of the driving recorder is faulty.

The driving recorder is a circular video, which will be automatically overwritten. There is no definite answer to how long it can be recorded. Different driving recorders have different video decoding and compression times.

If you must know how much time you can save, you can set the video duration to one minute, depending on how much memory a video takes up. If a video takes up 100M in one minute, then 1G= 1000M. The 8G card can record for about 74 minutes, and the normal recording opportunity will be automatically overwritten. When it is full, it will cover the front.

Extended data

Working principle of driving recorder:

The car driving recorder is similar to the "black box" used on the plane. Its working principle is to record and update the road conditions in front of or around the car through digital video, and even record information data such as car recording, car acceleration, steering, braking, etc., for the investigation of traffic story responsibility.

Segmented storage and cyclic photographing function of driving recorder;

Segmented storage is convenient for car owners to quickly retrieve and retrieve accident fragments after an accident (usually within a few minutes or seconds). Cyclic photography means that when the memory card is full, the driving recorder will automatically replace the latest recorded video clips with the earliest recorded video clips in chronological order, thus ensuring that the latest video clips can be completely saved.

Due to the use of segmented storage and loop photography, there is no continuity between two video clips, which is called lack of seconds. If there are a few seconds, it will be meaningless to the accident. Therefore, the driving recorder with stable performance and guaranteed quality is the most important.