How do I Stop My PC Booting from the USB? Efficient

How to change the boot order so your PC stops starting from a USB device, on both older BIOS and current UEFI systems.

Existing guide, retained and reviewed. In this preview build the body is not reproduced; on the live site the article text remains in place with the new title, description and layout applied.

For official information about USB standards and specifications, see USB-IF.