The Synology RX6025sas is a high-density 4U expansion unit designed to scale the HD6500 NAS up to 300 drive bays. Featuring 60 hot-swappable bays for 3.5" SAS HDDs and 2.5" SATA SSDs, it utilizes SAS multipathing for high performance and redundancy through automatic data rerouting. This plug-and-play unit connects via mini-SAS HD ports, allowing online volume expansion without service disruption. With dual redundant 1300W power supplies and enterprise-grade cooling, it is the ultimate scalable solution for massive backup repositories, surveillance, and post-production workflows.