Synology DiskStation DS1618+ is a versatile, compact, yet powerful 6-bay NAS equipped with quadcore processor, designed for small- and medium-sized businesses. It comes with advanced computing applications to meet businesses' demands and supercharges your storage with the optional M.2 SSD adapter card for dual SSD cache drives. DS1618+ is ideal to serve as a centralized file server for simplifying data management and protecting critical assets. Synology DS1618+ is backed with Synology's 3-year limited warranty.Extended Warranty - Extend warranty from 3 years to 5 Years with the additional purchase of EW201 ( Extended Warranty license must be registered at the same time as the NAS).