[https://www.tomshardware.com/how-to/boot-raspberry-pi-4-usb How to Boot Raspberry Pi 4 From a USB SSD or Flash Drive]
X825/X855 Allows booting OS from your HDD/SSD for faster app opens, web serving and file copying , A micro SD card is required for forcing the Raspbian OS to use the HDD/SSD for its "root" partition
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