The ACK-I-mSASx4-4SATAx1-SB-1m R is an internal Mini SAS x4 (SFF-8087) to (4) x1 SATA (controller based) fan-out cable with SFF-8448 sideband signals. It measures 1 meters and is used for connecting a SATA/SAS controller (SFF-8087) to SATA disks, or a SATA/SAS backplane.