Let me go further..
once you get to the set up you're going to need to partition the disk. then you're going to need to mount it then add the file system mkfs.filesystem /dev/whatever disk, then mount disks mount disk /mnt then pacstrap -i /mnt then genfstab then go through the usual setup.
Arch does it this way to keep people out. The community is not very inviting and if you were to ask this question in the actual Arch forums the post would likely have been deleted and a warning sent your way.
While Arch is the easiest of the "hard" distro's they do not have the welcoming vibe of say Slackware. Your are expected to have some knowledge walking in and are expected to google and read the wiki prior to asking any questions. If you go to the user facebook page it's even worse 2. THIS IS NOT LINUX TECH SUPPORT! If you need some, 1) use google. You'll be probably directed to https://wiki.archlinux.org/
. If you don't find an answer there, you can ask on the bbs or IRC ( http://goo.gl/XHtx6T
Questions should be phrased as follows
here is my problem
here is what I've read
here is what I tried
here is what's not working (followed by a paste of relevent output from terminal)
The only folks that are harder are free BSD types and they are more welcoming to newbs in many ways.
Re-burn you disk, actually READ the beginners guide then come back and ask questions. I'm not a nice person by nature but I will answer your questions as best as I can from a few timezones and many Km's away. Please remember though that Arch is all about self sufficiency.