Hiya...
I found out a solution (more info at http://www.linuxhardware.org/Features/03/04/16/1610236.shtml)
Summary: in the BIOS, you must set a "compatibility IDE mode" instead of "Enchanced". If I understood well, the Kernel which comes with the ISO don't recognize S-ATA drivers. Maybe a more up-to-date kernel does, but I couldn't try it (I have some problems with my network card, couldn't update my kernel).