• Unique Dual-DOM Design

  • Incredibly Easy To Use

  • Three Units In One

  • Unrivaled Data Security

  • Flexible Storage Options

  • Total Network Performance and Reliability




  • APC Magazine Highly Recommends the N5500

  • Thecus® N5500 Wins WhichNAS Performance Award

  • Thecus® N5500 Wins Bjorn3D Seal of Approval

  • Thecus® N5500 Earns Noticias 3D Best Choice Award

  • Reviews the Thecus® N5500

Dual DOM with Dual Protection (NAS server)

When people are searching for a NAS device, they invariably want something that is not only secure, but also performs well. They want it to be flexible enough to handle any situation, while simple enough to operate without having to have a degree in computer engineering. To that end, Thecus® Technology is proud to unveil its most advanced five-bas NAS unit yet-the N5500. Building off the success of the Thecus® N5200, the N5500 incorporates the latest Thecus® innovations for unrivaled efficiency and data security.


First and foremost, the N5500 is engineered to store your data and keep it safe. The N5500 is equipped with five hot-swappable SATA 3.5" hard disk bays for a whopping 10TB of total storage capacity. To protect this data, the N5500 lets you choose from a wide selection of RAID modes, including RAID 0, 1, 5, 6, and JBOD. The N5500 also supports multiple RAID volumes, enabling you to choose the right combination of RAID volumes for your network, and if you ever change your mind, the N5500 also features online RAID expansion, online RAID migration, and auto rebuild for maximum flexibility. In fact, the N5500 is the only storage solution on the market that can be configured as a NAS, a DAS, or an iSCSI device! A powerful Intel® CPU and dual Gigabit Ethernet ports with load balancing, failover, and link aggregation with 802.3ad, the N5500 lets you access your data quickly and reliably.


In a business environment, maintaining functional operation on storage device is critical. With the unique dual-DOM design, an extra DOM is installed to ensure continuous and flawless operation on N5500. Users do not need to worry about down-time due to unexpected system failure. The N5500 also shines in terms of flexibility with support for multiple file systems, including XFS, EXT3 and ZFS, and you can even select different file systems for each RAID volume. In addition to this, RAID volumes on the N5500 can also be encrypted for ultimate data protection and security. Those who require even greater performance will be happy to hear that the N5500 also supports iSCSI initiators, which means that you can enjoy blazing file transfer performance over Ethernet without the hassle and expense of fiber-channel.


For home users, the N5500 also has you covered with robust multimedia support, including an iTunes server, photo web server, and a media server which supports uPnP, making it the perfect central hub for all of your digital content. Debuting on the N5500 is Thecus’ new and AJAX-based web interface, which is more intuitive and easier to use than every before. The N5500 is also fully compatible with Windows, UNIX/Linux, and MAC OS 9/X operating systems, and a scheduled power on/off function means less wasted power and lower total cost of ownership. And with IP cam support, the N5500 can even be configured as a surveillance system for ultimate peace of mind.


With features like these, the N5500 represents the next level in NAS device flexibility and power.


"Powerful, flexible, and scalable, the N5500 is our most exciting five-bay NAS yet," notes Thecus General Manager Florence Shih. "Offering best-in-class speed, a bevy of useful features, and complete ease-of-use, users will be hard-pressed to find a five-bay NAS that measures up to the N5500 in both home and business environments."


Unique Dual-DOM Design

In business environment, maintaining functional operation on storage device is critical. With the unique Dual-DOM design, an extra DOM is installed to ensure continuous and flawless operation on N5500. Users do not need to worry about down-time due to unexpected system failure.

Incredibly Easy To Use

The N5500 features Thecus' next-generation web-based interface featuring AJAX technology, making it the easiest-to-use Thecus NAS ever.

Three Units In One

Flexibility is the name of the game. The N5500 is the only storage device that can be configured as a NAS, DAS, or iSCSI unit, making it a perfect fit for just about any configuration.

Unrivaled Data Security

The N5500 secures your data like never before. It supports RAID 0, 1, 5, 6, 10 and JBOD and multiple RAID volumes. What's more, the snapshot feature offers version control for even greater peace of mind by enabling you to easily restore previous snapshots.

Flexible Storage Options

Aside from supporting iSCSI initiators, the N5500 is also stackable, allowing you to control multiple N5500 units from one master system for added flexibility. In addition to this, you can choose from a selection of file systems, including EXT3, XFS and ZFS, which enables the N5500 to adapt to virtually any type of network.

Total Network Performance and Reliability

Because accessing your data is as important as securing it, the N5500 comes with dual Gigabit Ethernet ports with 802.3ad link aggregation for excellent data throughput. You can even select load balancing or failover, depending on your network configuration, to ensure maximum uptime and data availability.


  • Accessory Bag(with key)

  • Ethernet Cable

  • USB Cable (A-B Type)

  • Power Cord

  • Twonky Media Server CD

  • Universal CD

  • Acronis True Image DVD

  • QIG

  • Warranty Card

  • HDD Compatibility List Card


  • Firmware

  • Module

  • Manual & QIG

  • Utility

  • DM

Download here

1. Hardware Specifications

SATA device

  • 5 x SATA for internal, 1 x eSATA for external

System Memory


LAN Interface (PCI-e)

  • RJ-45x2 : 10/100/1000 BASE-TX Auto MDI/MDI-X WOL supported

USB Interface

  • USB 2.0 host port x5(Front x1, Back x4) (A Type)

  • USB 2.0 Target mode (B Type)

LCM Module

  • 2*20

LED indicator

  • Power(Blue)

  • System Status : Busy (FW Upgrade)(Orange)

  • HDD1-5 Activity/Fail(Green/Red)

  • WAN (Link : Green; Activity : Green)

  • LAN (Link : Green; Activity :Green)

  • RAID Status: Error (Red)

  • USB (Copy LED: Blue)

  • eSATA (Activity LED:Blue)

Power supply

  • 200W Power Supply support 2TB and above HDDx5

Disk interface

  • SATA I/II x5 via backplane

Thermal/Fan control

  • Thermal sensor on processor temperature

  • Temperature controlled system FAN speed

  • System fan monitoring


  • Power button(Front, power down controlled by S/W)

  • Reset button

  • LCM button (ENT,ESC,UP, DOWN)


  • 1 (For UPS)


  • Temperature : 5°C to 40°C

  • Humidity : 0 ~ 80 % R.H. (Non-condensing)


  • Tower Base

Sound Pressure Level


2. Software Functions


RAID modes

  • RAID 0, 1, 5,6,10,JBOD


  • Supported


  • Supported

Hot spare

  • Supported


  • Supported


  • Supported

On line RAID Migration

  • Supported

On line RAID Expansion

  • Supported

RAID Volume Encryption

  • AES256bit


Power management

  • Spin down while idle time setup

Bad Block Scan

  • Supported


  • Support roaming to other N5500



  • Fixed IP Address, Dynamic IP Address,

IP sharing mode

  • Can be enable/disabled

Transport Protocols

  • TCP/IP/Appletalk

File Protocols


Link Aggregation

  • 802.3ad, load balance and fail over

Data Access

Client OS support

  • Windows 7/2000/XP/2003/Vista

  • UNIX/Linux

  • Mac OS 9 / X


  • Web-based file access


  • File transmission protocol

Secure FTP

  • Secure File transmission protocol

Download Manager

  • HTTP / FTP / BT / eMule (Module)

Printer Server (IPP)

  • Support USB printers

  • Support IPP various printers

  • Client can manage(List/Delete) the print job queue on WEB interface

Data Backup

Client data backup

  • Acronis True image(OEM version)

Client system Disaster Recovery

  • Acronis True image(OEM version)

NAS Remote Replication

  • Via Thecus proprietary Nsync

USB device copy to N5500

  • Through LCM to control


  • Supported

Bi-directional USB Copy

  • Supported

Block Level Access

iSCSI Target

  • Support Microsoft/Mac/Linux Initiator

iSCSI initiator

  • For stackable with N5200/1U4500/N7700

iSCSI Thin Provisioning

  • Supported

Power management

Schedule power on/off

  • Supported

Volume management

Multiple RAID

  • Supported

Multiple file system selectable

  • Ext3 / XFS / ZFS

Multimedia Support (Options for module upload)

iTunes Server

  • Supported File Types: AAC, MP3 w/ ID3 tag, WAV

Photo Web Server

  • Supported File Types: GIF, JPG (JPEG), BMP, PNG

  • Supports EXIF display

  • Supports slide show

Media server

  • Supports uPnP AV streaming protocol

User Authentication

Local User

  • Supports built-in user accounts

Local Group

  • Supports built-in user groups

Windows NT/ADS

  • Supported

File System


  • Journaling File System


  • 10TB (XFS,ZFS) / 8TB (ext3) per volume

Language Support

  • Unicode Support

Authorization (ACL)

  • Read, Write or Deny options on individual users or groups for share and sub-folders


Multi-Lingual Web-based administration (Default auto)

  • Web-based server management Interface Supports English, Traditional Chinese, Simplified Chinese, Japanese, Korean, French, German, Italian, Spanish, Russian and Polish

Utility Program

  • MS Windows Setup Wizard,

  • supports Windows 7/2000/XP/2003/Vista

  • Mac setup Wizard (OSX only)

Email notification

  • Sends system messages via Email to system administrator

SNMP trap

  • System information trap out


Dual DOM

  • Supported

Web Disk

  • Supported

Recycled bin

  • Supported

Web Server

  • Supported

ISO Mount

  • Supported

User module

  • Supported

IP CAM surveillance Server

  • Supports up to 5 IP CAM