maybe I found something very interesting...
4x1 SATA/USB Hardware Port Multiplier System Version (AD4SR5HPMUS)
http://www.addonics.com/products/host_controller/ad4sr5hpmus.asp
The description says it is OS independent and supports Hardware RAID; so when you attach it to your SATA port, your system will see it as a single hard drive...
Now I have to find if is there someone who sells it in Italy or at least somewhere closer than US