What is the issue?

BlackVue dash cams are constantly recording when in use, unless they are in parking mode (when they will only record on motion detection or impact). Due to this, the effective life span of the 'current footage' on the micro SD card can get overwritten in less than a day.

Due to the physical limitations of the microSD card size and compression-video quality available today, it is not possible to retain footage for more than a week.

Why is this occurring?

BlackVue dash cameras record to a micro SD card and utilise a feature known as 'loop-recording'. Put simply, the oldest footage is overwritten with the newest. This is so you do not need to manually format your SD card every few hours to make room for the newest footage.

Imagine an old-fashioned water-wheel, which uses the weight of a full bucket of water to pull the wheel. It rotates in a cycle by emptying and refilling buckets of water. If you think of each bucket as a video file on the SD card, you can imagine how the holdest file/bucket is overwritten/emptied to make room for the new file/water.

What can be done to prevent this?

You can understand the available recording times via one of the recording time-tables. You will need your dash camera model and SD card size to know what recording times you can expect.

Event files on the DR750S and DR900S models can be safe-locked to the SD card to prevent overwriting up to a maximum of 50 event files. This must be enabled in the firmware settings.