SFF 8643 to SFF 8482 minisas to sas breakout cable, internal mini sas hd connector male connect to sas controller or motherboard, sas 4 sff-8482 connectors with sata power connect to backplane or 4 hdd, each SAS sff-8482 adapter contain sata 7pin data and sata 15pin power connector, NO middle SAS pins, Note: sff-8643 to 4 sff-8482 cable 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