Connect a SATA drive to a legacy IDE port, or an IDE drive to a SATA motherboard port. Cost-effective solution for upgrading existing IDE systems to support SATA drives. Contents: Adaptor, power cable and SATA data cable.
Without these i wouldnt be able to run windows98 on my asus k8v-se deluxe motherboard as its VIA sata controller (k8t800t) doesnt support any type of SATA3 drive
so for me theyve been a lifesaver.