Linux – How to optimize Arch linux boot time

As jasonwryan pointed out, you can do this more easily by using the AUR package. On the same wiki page that you provided, there is the Install method 2 - AUR entry, which explains how to install it through AUR. That approach should be easier and much more maintainable than doing it manually.

edit: to install ksh, please take a look at its PKGBUILD

# AT&T requires the user to agree to a license agreement before downloading the
# source, so I didn't include the direct URLs in the PKGBUILD. Just visit
# 'http://www.research.att.com/~gsf/download/', download
# 'ast-ksh.2009-05-05.tgz' and 'INIT.2009-05-05.tgz', and place them in the
# same directory as the PKGBUILD before running makepkg

What you will have to do is:

1. go here and download the needed packages
2. put them both in the some directory
3. navigate to that directory
4. create md5 hashes for that two packages with md5sum filename
5. execute yaourt -S ksh from the directory where the two packages are
6. when asked if you want to edit PKGBUILD say yes
7. edit source and md5sums lines (with new file names and new hashes)
8. save changes and exit editing
9. continue building ksh

If everything else is alright, ksh should install without problem.

You're using variable block names (/dev/sdX) and when you attach the second drive, your original drive's name changes. The solution is simple, just use persistent block names (by UUID) in your kernel boot parameters and in /etc/fstab.

PS. Welcome to Arch, you won't switch back... I recommend checking out Yaourt for the full community experience. Honestly, the community repository and the incredible wiki have made Arch the most user-friendly distro for me, despite its reputation.