Thecus W4810 4-Bay Diskless NAS Box | W4810 Enhanced Boot Drive: Embedded SSD To ensure the best performance possible, each WSS 2012 R2 Essentials copy is pre-installed on an embedded solid state drive. These boot drives are independent from the drive bays and allow for seamless setup and integration. Windows Storage Server 2012 R2 Essentials Windows Storage Server 2012 R2 Essentials is the latest version of Windows Storage Server that is designed for small businesses that want to leverage cloud services in a NAS appliance. It enables cross-premise functionality, providing small businesses with robust on-premises solution for file and print, client backup and restore, secure remote access, and identity management services, combined with optional off-premise services supported by Microsoft. >>More