'How to solve “not initialized” usb problem?

I wanted to install arch Linux on my usb and run it with my Mac. But when I format the drive to FAT-30, and use “guid partition table”, and next try to put the iso with Etcher, on my usb, my drive gets “uninitialized”, in the diskUtility app and I can’t do anything with it. I tried restarting the Mac, replugging the usb, nothing changes. Any help would be appreciated :)

usb


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