The ACK-I-mSASx4-mSASx4-0.5m R is an internal Mini Serial Attached SCSI x4 (SFF-8087) to x4 (SFF-8087) Mini Serial Attached SCSI cable. It measures 0.5 meters and is used for connecting a SATA/SAS ...
The ACK-E-mSASx4-mSASx4-1M R is an external mini Serial Attached SCSI x4 (SFF-8088) to x4 (SFF-8088) mini Serial Attached SCSI cable measuring 1 meter. This cable is RoHS compliant.