you can use them both adto lang e set sa Bios ang harddisk setting/ storage nga nka IDE Mode then it also depends sa imong OS like nka IDE ang Master then Nka Windows 7 imong OS. there are conflicts sa SATA nga HDD. so if dili mo work both pag set nimo sa BIOS also if dugay gyud sila mo Boot or mo Log Sa windows. there is a problem sa imong harddisk.
Your Last Resort would be backup the files and format then partion both HDD's then set the Sata as primary and make your IDE as secondary or it will serve as a backup drive for small files like documents.