video tutorial: https://www.youtube.com/watch?v=1nPesiEhuic

sudo pacman -S arch-install-scripts

***make sure usb is NOT mounted***

wipefs -a /dev/sdf
fdisk /dev/sdf

disable journal
mkfs.ext4 -O "^has_journal" /dev/sdf1

mount and install arch as usual:
mount /dev/sdf1 /mnt
pacstrap /mnt base base-devel

genfstab -U /mnt >> /mnt/etc/fstab
arch-chroot /mnt
passwd
localectl set-keymap --no-convert la-latin1

Persistent:
e2label /dev/sdf1 arch64

mkinitcpio -p linux
grub-install --removable /dev/sdf