Synology DiskStation DS920+ is an ideal network-attached storage solution designed to streamline data management and productivity. Two built-in M.2 SSD slots and Synology SSD Cache technology allow you to boost system I/O and application performance. With scalable storage design, DS920+ lets you start small and expand storage capacity with the Synology DX517 as your data grows.Warranty can be extended to 5yrs with the purchase of EW201!