This document provides instructions for installing Arch Linux on a USB flash drive in 9 steps:
1) Obtain an 8GB+ USB drive and burn the Arch Linux ISO to DVD or USB.
2) Partition the USB drive and make one partition bootable and another for persistence.
3) Install Arch Linux to the USB partitions while configuring files like fstab.
4) Install GRUB bootloader to the USB and reboot into the new Arch Linux installation.