我的BIOS不支持从USB引导吗？

If this is the ONLY screen that is related to the boot order in your BIOS setup, it doesn't seem to support USB boot.

HOWEVER, in some BIOS settings I saw before, the HDD: 4M-SAMSUNG HD1 item in the boot list is actually alternable.

Sometimes there is a seperate setup sub-menu in the BIOS setup where you can setup the priorities of all HDDs on the computer and only the HDD with the highest priority in that list appears in the boot menus as an HDD: ... item.

Try if you can find such a menu in your BIOS setup and if yes, try if you can find your USB drive in that menu and make it first. After that, the HDD: 4M-SAMSUNG HD1 item will become something like HDD: USB... and then you can boot from it as you boot from an internal HDD.

顺便说一句，如果您的PC / BIOS不太旧，则应该支持USB引导。甚至连我8岁的HP笔记本电脑（2006年购买）都支持USB引导，而无需升级BIOS。