I’ve installed Arch Linux in a few VM’s (Virtualbox / Windows 7) and each time it is slightly different. These are my notes from a successful install. Virtualbox v4.3.22, Arch Linux 2015/02/01.
Start by downloading the ISO image of the latest Arch Linux distro, use the torrent link to go faster. You can use Deluge, an open source torrent client. Burn it to a CD so it can have it at hand. InfraRecorder works great and it is open source.
Start Virtualbox and create a VM, if you type “Arch” in the new VM name it will automatically change the type to linux and the version to Arch linux 64 bit, nice! I want a small VM so I just configure 1024Mb of RAM and 50Gb of virtual hard drive.
Insert your Arch Linux CD and start the new VM, sometimes you need to go to Devices menu and set your CD reader, sometimes it is already done for you.
Boot your system from the CD /first option) until you get the shell prompt, then using fdisk create new partitions in your new virtual drive. There are lots of info on how to create partitions so I wont get into details. Anyway I was following the Arch Linux documentation, the installation guide is great.