5-bay extension of SATA 3.5’/2.5’ You can easily add 5 additional disk pockets to Synology DiskStation1 solution. With SATA 2.5" and 3.5" support, the DX517 is a flexible solution to expand volumes on demand, which can also act as a local backup destination. Expanding network volumes Managed from DiskStation Manager on the NAS, additional pockets in the DX517 unit are ready for use just after the connection. The on-demand volume expansion option allows for continuous storage and service operation on the host while expanding the volume. Hot-swap Disk pockets allow replacement during operation of the DX517 unit, so you can easily install and replace the disk without having to disable the system. The design without screws reduces the time needed to configure the system. Special solution for local backup The Synology DX517 unit can serve as a solution to support local backups for the DiskStation Synology server. The DX517 unit operating as a separate volume can be an excellent backup solution for local hard drives, ensuring safety in case of system failure.