I’ll show you how to boot the Pi 4 with an external USB 3.0 SSD, then show some benchmarks that highlight the huge speed difference you get when you run from an SSD versus a microSD card.

Blog post that accompanies this video: https://www.jeffgeerling.com/blog/2020/im-booting-my-raspberry-pi-4-usb-ssd

“Pi 4 a Day” – Watch me try replacing my Mac with a Pi for a whole day: https://www.youtube.com/watch?v=OU6jHvVqJxY

Kingston 240 GB SSD: https://amzn.to/37IBYCd
Inateck USB 3.0 Enclosure: https://amzn.to/3dgO4U8

source