https://www.icarvisions.com/faq/why-the-sd-mirror-recording-is-much-smaller-than-the-regular-recording-of-the-main-stream-491.html
Why the SD mirror recording is much smaller than the regular recording of the main...
What this FAQ covers: An explanatory guide to understand why SD mirror recording files are smaller than main stream recording files on MDVR devices. It...
mirror recordingsmaller thanmuchregularmain