Synology Disk Station DS1520 - NAS Server - 0GB Average 19.8 performance boost to photo indexing and other computing-intensive operations, as well as database response time Built-in M.2 2280 NVMe SSD slots permit cache acceleration without occupying storage drive bays Flexibly scale up to fifteen drives to increase storage capacity as demand grows Build an on-premises, multi-user collaboration environment with fined-grained control Back up critical data and reduce Recovery Time Objective (RTO) with Snapshot Replication Set up and run mainstream virtual machines on your Synology NAS Synology DiskStation DS1520 is an ideal network-attached storage solution,suitable for small office and IT enthusiasts. 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,DS1520 lets you start small and expand storage capacity with the Synology DX517 as your data grows. Optimize performance and capacity DS1520 provides two built-in M.2 SSD slots so that you can take full advantage of Synology SSD Cache functionality. Add SSD cache for up to 20 times faster I/O response without using front drive bays. Accelerate demanding applications A more powerful CPU speeds up computing-intensive applications. The quad-core processor boosts photo indexing,database response times,and web PHP response efficiency. Easily categorize your photo memories,smoothly manage files across computers and mobile devices,and enjoy blazing fast web applications. Technical Specification Synology Disk Station DS1520 - NAS Server - 0GB General Device Type    NAS server Host Connectivity    Gigabit Ethernet Total Storage Capacity    0 GB Installed Devices / Modules Qty    0 (installed) / 5 (max) Width    23 cm Depth    22.3 cm Height    16.6 cm Weight    2.26 kg Processor / Memory Processors Installed    1 x Intel Celeron J4125 2 GHz Number of Cores    Quad-Core Max Supported Qty    1 Max Turbo Speed    2.7 GHz RAM    8 GB DDR4 Storage Controller Type    RAID Interface Type    SATA 6Gb/s RAID Level    RAID 0, RAID 1, RAID 5, RAID 6, RAID 10, JBOD Networking Data Link Protocol    10Mb LAN, 100Mb LAN, GigE Network / Transport Protocol    TCP/IP, PPTP, L2TP, iSCSI, FTP Remote Management Protocol    SNMP, Telnet, SSH Network Services Compatibility    Microsoft Active Directory (AD), File Level Security (ACLs), Microsoft CIFS, Network File System (NFS), FTP, Apple File Protocol (AFP), HTTPS, Web-based Distributed Authoring and Versioning (WebDAV), Calendaring Extensions to WebDAV (CalDAV) Features    Firewall protection, hardware encryption, VPN support, LDAP support, wake on LAN (WOL), Syslog support, E-mail alert, High Availability, video server, web server, backup server, file sharing, anti-malware protection, Trivial File Transfer Protocol (TFTP) support, Access Control List (ACL) support, SSH support, iTunes server, Samba support, FTP server, surveillance station, PXE support, Apple Time Machine compatible, cloud backup, VPN Server, SFTP client, anti-virus protection, DLNA support Encryption Algorithm    SSL, TLS Compliant Standards    DLNA CERTIFIED Expansion / Connectivity Expansion Bays    5 (total) / 5 (free) x hot-swap - 2.5\" / 3.5\" Interfaces    2 x USB 3.0 - Type A ¦ 4 x Ethernet 1000Base-T - RJ-45 ¦ 2 x eSATA Miscellaneous Cables Included    2 x network cable Features    Security lock slot (cable lock sold separately), wake on LAN, built-in 2 cooling fans, hardware encryption Security Slot Type    Kensington security slot Compliant Standards    FCC Class B certified, RoHS, BSMI Class B Included Accessories    Accessory pack Power Power Device    Internal power supply Voltage Required    AC 120/230 V (50/60 Hz) Power Consumption Operational    36.67 Watt Power Consumption Stand by    15.51 Watt Power Provided    120 Watt Software / System Requirements Storage Operating System    Synology DiskStation Manager Software Included    Drivers & Utilities OS Required    Microsoft Windows 7 or later, Apple MacOS X 10.10 or later Manufacturer Warranty Service & Support    Limited warranty - 3 years Environmental Parameters Min Operating Temperature    0 °C Max Operating Temperature    40 °C Humidity Range Operating    5 - 95 Sound Emission    20.8 dBA