Eli5 how does the record last 30 seconds feature on Xbox/switch work?

Question

I’m not talking about how to use it I want to know what makes it work

In: Technology

Answer 1

A hardware video encoder is always running, but only keeping the last 30 seconds recorded unless a user decides to save a recording.

Answer 2

The console is always recording. When you record the last 30 Seconds what actually happens is the recording is moved from Memory to disc.