LaCie NAS OS 3

Access. Control. Security. NAS OS 3, LaCie's dramatic upgrade to its professional NAS operating system, powers LaCie’s premium business NAS. NAS OS 3 delivers the features businesses need in an interface that makes performing tasks quick and pleasant. It also offers professionals sophisticated RAID security and real-time hardware monitoring.


Effortless Storage Management

Built in-house by LaCie, NAS OS 3 delivers business-focused features in an intuitive, easy-to-use, web-based interface, simplifying setup and management. NAS OS 3 is tuned specifically for our range of NAS servers to deliver optimal performance, reliability, and efficiency.*

Sdrive for
Anywhere Access

Using Sdrive™ apps for PC, Mac®, or mobile devices, your entire team can access files stored on your LaCie NAS, wherever they are in the world. Thanks to file system integration, the storage of your LaCie NAS mounts on your computer just like an external hard drive so you can easily drag and drop files from your computer onto the LaCie NAS.

Better External File

What's more, instead of using FTP or email to share files with external clients, simply provide them access to LaCie NAS’s browser-based file explorer. They can download files directly without needing to be granted access to your company's network. Having no file size restrictions means that you can share large files easier than ever.


All-Points Security for Constant Data Availability

Files need to be constantly available or productivity suffers. That's why LaCie designed NAS OS 3 to protect files stored on the NAS with disk-failure proof, hardware-level RAID protection. If a single disk fails, you can replace it without turning off your device. Just swap in a new one without losing a single byte of data. The SimplyRAID feature** can even control RAID for you, making advanced data security simple enough for novices. Using SimplyRAID, you also get improved available storage compared to traditional RAID solutions when using disks of different sizes.


Easy Maintenance and Troubleshooting

Prevent downtime by keeping a close eye on your hardware. NAS OS 3 now features hardware monitoring that alerts you in real-time of potential issues with the fan, CPU, and RAM. It also features SMART hard disk diagnostics. Stay on top of your data security with hardware status email alerts.

* NAS OS 3 ships on new LaCie 2big NAS and LaCie 5big NAS Pro. Customers with LaCie 2big NAS running NAS OS 2.x can also upgrade.
** LaCie 5big NAS Pro only.
*** NAS must be rsync-compatible. For LaCie NAS, both client and server must be running NAS OS 2.2 or later.

File Access
Network Protocols
RAID Modes
Backup Solutions
Special Features
Environment & Power
Supported Languages
System Requirements
  • LaCie NAS OS 3
Sdrive™: Single interface for local and remote access with file system integration
Compatible with PC, Mac®, iOS®, and Android®
File Server: SMB, AFP, FTP, SFTP, NFS*
Web access: HTTP, HTTPS
Others: Apple® Bonjour™, BitTorrent™, NTP, iSCSI, DHCP, APIPA, 802.3ad for link aggregation and failover**
Standard RAID modes: 0, 1, 5**, 5+ spare**
SimplyRAID for automatic RAID migration, expansion, and support for mixed capacities**
Multi-volume support
PC to NAS: using client software (Time Machine®, Windows® Backup, etc.)
NAS to DAS: scheduled, automatic, and restore
NAS to NAS: scheduled, encrypted, compressed, and automatic to local or remote NAS***
Print server▲
Download (torrent) machine
Time Machine compatibility
Active Directory® support
Rescue utility for NAS OS setup and repair**
Direct access to NAS using Sdrive
User-friendly management interface (Dashboard)
UPnP A/V media adapter compatible
Photo browser and audio streaming through web interface
iTunes™ (DAAP) server
Automatic standby mode; scheduled On/Off; Wake on LAN
Uninterrupted Power Supply (UPS) support▲▲
English, Danska, Deutsch, Español, Français, Italiano, 日
本, Nederlands, Svenska, Português, 中文
Latest version of Windows 7 or Windows 8 / Mac OS X 10.5 or later
Web browsers: Internet Explorer™ 8/9/10, or the latest version of Firefox™ Safari™, or Chrome / Computer with an Ethernet network adapter
Ethernet switch or router 10/100/1 GB
* Without authentication.
** LaCie 5big NAS Pro only.
*** NAS must be rsync-compatible. For LaCie NAS, both client and server must be running NAS OS 2.2 or later.
▲ Please refer to for a list of supported printers.
▲▲ For a list of supported UPSs, please see: