n.b. Unetbootin was a bit finnicky for me, I found that if I created the drive with a FreeDOS live CD that it wouldn't work, but if I then re-created using unetbootin's automatic distribution download feature, the USB stick worked a treat. YMMV.

If you have a new hard drive you can add it now. Here are some instructions to use for 4TB HDD using partedto make sure the alignment is right. Example here is with a new HDD that appears as /dev/sdb (read here: http://rainbow.chard.org/2013/01/30/how-to-align-partitions-for-best-performance-using-parted/)