Help Required regarding sata HDD

i have intel 850 Board (old now), Connected two 120 gb ide HDD, one dvd rw , one dvd rom, now i want to add one more hdd, so i choose 250 gb hdd, my friend suggest me to buy a sata hdd, now the problem is i don't have any sata connectors on my board, i have heard about sata host adopter pci card, which gives me internal sata port, i want to know more about this card if anybody heard about it then please help me

sorry, posted in wrong sec i think, mod please move it to hardware sec please