For Hitachi i think you need to use a firmware switch ,to achieve the Sata 1 and even then it may not work.
Unfortunately the SATA controller is outdated for your new HDD.
You could search for older HDD-s known to work or you could buy a SATA controller PCI board ,but that poses the risk as well to not work with that KT 600 board and even if it works to perform very slow 50 megs/s max ,PCI bus limited.
This is the link for Hitachi utility :
http://www.hitachigst.com/support/downloads/What you need is the "Feature Tool"utility and this one has a warning
"Warning! Switching your drive to support 3.0Gb/s, or enabling spread spectrum clocking and then using it, may render your drive unusable in a system that cannot support these functions. If in doubt, please contact your system manufacturer"