|You don't. RAID 0 is what you are asking about and that configuration even if it were possible using one IDE drive and one SATA (Which it isn't) would not have any appreciable difference in your perceived system performance. Such a configuration also places all your data at risk. When (not IF) one of your drives fails in a RAID 0 configuration you lose the lot.|
You need to look at other solutions to your system performance issues such as clogged startup list, surplus temp files, defragging, disk cleanup etc.
Goin' Fishin' (Some day)