SFF 8643 to SFF 8482 sas breakout cable, internal mini sas hd connector connect to sas controller or motherboard, SAS 4 sff-8482 connectors with sata power connect to backplane or 4 hdd, each SAS SFF8482 adapter contain sata 7 pin data and sata 15 pin power adapter, Note: sff-8643 to 4 sff-8482 cable this do Not work with SAS Driver, Donot connect SFF-8643 on your backplane, otherwise the mini sas hd to sas breakout will not work with them