CableCreation (Reversed Internal HD Mini SAS (SFF-8643) Target to 4X SATA (Host) Cable, SFF-8643 to 4X SATA Cable, (Reversed Version) SFF-8643 for Backplane, 4 Sata Connect to Controller 1.6FT This is Reversed Cable, 4x7Pin Sata is host ,connect to the motherboard or RAID Controller with SATA ports. SFF-8643 is the target , connect to the Backplane with MINI-SAS port Before you buy this cable , please make sure the Mini SAS (SFF-8643) is located on your backplane. If the Mini SAS (SFF-8643) is on your motherboard or RAID Controller, this cable will not work. SFF-8643: the new connector allows higher port density for internal hosts and devices. Hybrid versions of these new cables will allow a smooth transition from 6Gb to 12Gb. Serial Attached SCSI (SAS) is a high-speed data storage interface designed for high-throughput and fast data access Cable Length 0.5M