1) It can connect the SATA hard disk to SATA motherboard. 2) It can connect the SAS hard disk to SAS motherboard. 3) It can't connect the SAS hard disk to normal SATA motherboard. (it will be worked if your motherboard has the SAS chipset, Otherwise can't work.) 4) It can't connect the SATA hard disk to normal SAS motherboard. (it will be worked if your hard disk has the SAS chipset, Otherwise can't work.) 5) This SAS adapter enables you to connect a SAS HDD with SFF 8482 port to a SAS compatible SATA controller (hybrid controller).