SFF-8643 is the target, connect to the hard drives with SATA port. The connector is from 4 x SATA-7Pin to 1 x SFF-8643. 1 x Mini SAS (SFF-8643 Target ) To 4x SATA (Host) Hard Drive Cable. If the Mini SAS (4 SATA) on your backplane, this cable will not work with them.
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