Yes, your SATA controller is running in HP raid mode: vendor-id 8086, device-id 0x282a.
You can use the HPRAIDInjector.kext that I posted here:
http://www.tonymacx86.com/laptop-co...-envy-dv6-7202se-compatible-6.html#post652734
You will need to install it to your Unibeast USB. Install to /Extra/Extensions on the USB and give it a try. Usually the Extra folder is hidden so you need to use Finder's Go to Folder and type the path explicitly. If you named your USB 'Installer' you would type '/Volumes/Installer/Extra/Extensions'
Alternately you can unhide some things on the USB in Terminal:
Code:
# again assuming you called it Installer
sudo chflags -R nohidden /Volumes/Installer/Extra
sudo chflags -R nohidden /Volumes/Installer/System