| Browser supported | Microsoft Internet Explorer 10+, Google Chrome, Apple Safari 7+, Mozilla Firefox |
| Operating system version | 4.3 |
| Number of screws | 112 |
| Width | 18.9" |
| Depth | 21.1" |
| Height | 5.12" |
| Weight | 34 lbs |
| Type | NAS |
| Device class | Small & Medium Business |
| Maximum RAM supported | 64 GB |
| PCI Express x4 (Gen 3.x) slots | 1 |
| Share folder | CIFS/SMB |
| Fan voltage | 12 V |
| Ethernet LAN data rate supported (max) | 10000 Mbit/s |
| Quick installation guide | Yes |
| Supported file systems | FAT32, HFS+, NTFS, exFAT, ext3, ext4 |
| Wake-on-LAN ready | Yes |
| Power management | Yes |
| Access Control List (ACL) | Yes |
| Digital Living Network Alliance (DLNA) certified | Yes |
| Multilingual support | Yes |
| Built-in iTunes server | Yes |
| Built-in FTP server | Yes |
| Product color | Black |
| Ethernet LAN (RJ-45) ports | 4 |
| USB 2.0 ports quantity | 4 |
| USB 3.2 Gen 1 (3.1 Gen 1) Type-A ports quantity | 2 |
| USB port | Yes |
| Chassis type | Rack (3U) |
| Operating temperature (T-T) | 0 - 40 °C |
| Operating relative humidity (H-H) | 5 - 95 % |
| Power supply unit (PSU) capacity | 350 W |
| AC input frequency | 50 - 60 Hz |
| AC input voltage | 100 - 240 V |
| Number of power supply units | 2 |
| Power supply location | Built-in |
| Redundant power supply (RPS) support | Yes |
| Internal memory | 8 GB |
| Internal memory type | DDR4 |
| Number of fans | 4 fan(s) |
| Cooling type | Active |
| LED indicators | HDD, LAN, Power, Status |
| S.M.A.R.T. support | Yes |
| Linux operating systems supported | Yes |
| Mac compatibility | Yes |
| Cables included | AC, LAN (RJ-45) |
| Fan diameter | 3.62" |
| Fiber optic connector | SFP+ |
| Fiber ports quantity | 2 |
| Backup features | Cloud, iSCSI LUN |
| Processor frequency | 2.1 GHz |
| Ethernet LAN | Yes |
| Backup function | Yes |
| Reset button | Yes |
| Number of storage drives supported | 18 |
| Supported storage drive types | HDD & SSD |
| Storage drive interface | M.2, Serial ATA III |
| Storage drive size | 2.5/3.5" |
| RAID support | Yes |
| RAID levels | 0, 1, 5, 6, 10, JBOD |
| Storage drives installed | No |
| Total installed storage capacity | 0 TB |
| Installed storage drive type | No |
| Number of storage drives installed | 0 |
| Storage drive capacity | 0 GB |
| Ethernet LAN data rates | 10,100,1000 Mbit/s |
| Wi-Fi | No |
| DHCP client | Yes |
| iSCSI support | Yes |
| Web-based management | Yes |
| DHCP server | Yes |
| Windows operating systems supported | Windows 10 Education, Windows 10 Education x64, Windows 10 Enterprise, Windows 10 Enterprise x64, Windows 10 Home, Windows 10 Home x64, Windows 10 IOT Core, Windows 10 Pro, Windows 10 Pro x64, Windows 7 Enterprise, Windows 7 Enterprise x64, Windows 7 Home Basic, Windows 7 Home Basic x64, Windows 7 Home Premium, Windows 7 Home Premium x64, Windows 7 Professional, Windows 7 Professional x64, Windows 7 Starter, Windows 7 Starter x64, Windows 7 Ultimate, Windows 7 Ultimate x64, Windows 8, Windows 8 Enterprise, Windows 8 Enterprise x64, Windows 8 Pro, Windows 8 Pro x64, Windows 8 x64 |
| Mac operating systems supported | Mac OS X 10.10 Yosemite, Mac OS X 10.11 El Capitan, Mac OS X 10.12 Sierra, Mac OS X 10.7 Lion, Mac OS X 10.8 Mountain Lion, Mac OS X 10.9 Mavericks |
| Flash memory | 512 MB |
| Memory slots | 4 |
| Processor family | AMD Embedded R-Series SoC |
| Processor model | RX-421ND |
| Processor boost frequency | 3.4 GHz |
| Processor cores | 4 |
| Operating system installed | QNAP Turbo System |
| Server operating systems supported | Windows Server 2003, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2 |
| Security algorithms | 256-bit AES, FIPS 140-2, HTTPS, SNMP, SNMPv3, SSH, SSL/TLS |
| Supported network protocols | CIFS/SMB, AFP v3.3, NFS v3, FTP, FTPS, SFTP, TFTP, HTTP(S), Telnet, SSH, iSCSI, SNMP, SMTP, SMSC |