The Synology DX525 is a 5-bay expansion enclosure designed for seamless storage scalability for compatible DiskStation models like the DS1825+, DS1525+, and DS925+. Connecting via a USB-C expansion port, it allows for plug-and-play setup and immediate recognition through DSM. This unit supports hot-swappable 3.5" and 2.5" SATA drives, enabling online volume expansion without service downtime. Whether used to enlarge existing storage pools or as a dedicated local backup destination, the DX525 provides a flexible, reliable solution for growing data needs, managed directly from the host NAS for unified administration. (579 characters)