I-MSASX4-4SATAX1-SB 0.5M R SAS INT CBL The ACK-I-mSASx4-4SATAx1-SB-0.5m R is an internal Mini Serial Attached SCSI x4 (SFF-8087) to (4) x1 Serial ATA (controller based) fan-out cable with SFF-8448 sideband signals. It measures 0.5 meter and is used for connecting a SATA/SAS controller (SFF-8087) to SATA disks, or a SATA/SAS backplane.