https://wccftech.com/galaxy-s20-8k-video-storage-usage/

Most of you may not know this, but the Galaxy S20, Galaxy S20 Plus, and Galaxy S20 Ultra all support 8K video recording at 30FPS. That much throughput requires a lot of data to be written to the storage locally in 60 seconds, but how much of the internal memory actually gets used up during recording? We have the numbers, and you’ll definitely want to know how much storage you need to spare.

That is correct; more than half a gigabyte of image data is written onto the storage while recording 8K footage on your smartphone. It’s worth noting that the video being recorded isn’t captured at 30FPS, but a lower 24FPS. This means that if there is an option to record 8K video at 30FPS, more storage will be used up per minute. One reason why this resolution is being recorded at 24FPS is most likely to deliver that cinematic experience. A lot of movies are shot at 24FPS, so it doesn’t come as a surprise this setting is available.