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Thecus > 
Item#: 9SIA0AJ1UJ9838

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

Thecus is proud to present itself as a technological innovator. Once again, Thecus releases an all new 5-bay N5550 server to lead the competition. The past proves merit: link aggregation, LCM display, USB 3.0, multi RAID functions and so on. Impressive technologies have been used to develop the new N5550 NAS to serve one single purpose: improve user experience and satisfaction.

Intel Atom CPU: silent power

Intel Atom CPUs are designed to work without fans. This will dramatically reduce NAS noise and power consumption.

Associated with 2GB of DDR3, Intel Atom CPUs will provide much better performance. Don’t be restricted to a 4-bay NAS, bring it up a notch, Thecus N5550 is available and boosts the best performance with a great price, without entering larger bay units. Multi-users environment, web hosting, intense backup, data encryption, application serving, heavy RAID computations, and HD multimedia streaming: welcome to the world of smooth multi-tasking!

McAfee Antivirus: preventing possible threats

The N5550 NAS is McAfee antivirus embedded meaning that users can have confidence that their sensitive data will be protected by the most advanced antivirus software, McAfee.

USB 3.0: from optional to mandatory

Thecus started integrating USB 3.0 more than one year ago, enabling this blazing fast protocol on most storage devices by embedding a PCI-e slot. On popular demand, future NAS will equip at least one port for USB 3.0 transfer rates of 10 times faster than USB 2.0.

HDMI, VGA and Audio out: removing the middle man

After installing the proper module, simply plug a screen by the use of HDMI output, you don’t even need a computer anymore to check on your NAS! Local display via HDMI makes things that much more convenient, directly attach keyboard and mouse to start data management.

The N5550 also supports VGA output for attaching traditional televisions, projectors and monitors. VGA output makes this 5-bay NAS convenient to display presentation or media files when HDMI is not on hand.

To add, users can attach speakers directly to the N5550 NAS to play audio files. With audio out, managing media and audio files is simple; attach the speaker plug to audio out and you’re set to go!

Ideal for small installations and/or mobile users, these features are designed to lower the total cost of ownership of your network architecture.


  • newegg Antivirus Thecus’ innovative hardware helps prevent failures. But sometimes you have to protect the NAS against itself. Adding an antivirus to the already comprehensive software bundle will provide the necessary software protection by scanning the files on your NAS and defending it against possible threats. McAfee is the world’s largest dedicated security technology company and shares Thecus’ spirit of dedication and quality. By establishing a strong partnership with them, Thecus will allow users the benefit of McAfee’s powerful software on their NAS entirely for free.
  • newegg Cloud Backup The private and public clouds meet with Thecus’ new DropBox, Amazon S3 and ElephantDrive cloud backup functionality! Guard your data with RAID at home and an additional level of protection in the Cloud. Just drag and drop files into the folder on your NAS and access them on any computer or mobile device with DropBox, Amazon S3 or ElephantDrive.
  • newegg Multiple RAID When it comes to data management, Thecus NAS truly let you have it your way. Create multiple RAID volumes each supporting different RAID modes including RAID 0, 1, 5, 6, 10 and JBOD for your own balance of performance and data protection. Should a hard drive malfunction occur, changing one is simple thanks to online RAID migration and expansion, hot spare, and auto rebuild.
  • newegg iSCSI Thin-Provisioning Get the most out of your storage space with the extreme speed of iSCSI and the efficiency of iSCSI thin provisioning. Connect through iSCSI for the fastest data transfer speeds available and make wasted disk space a thing of the past with thin provisioning's flexible storage functionality.
  • newegg iOS/Android Connectivity In the modern world, nothing is as important as reaching your data from anywhere. With ThecusShare and the Thecus Dashboard, you can manage your NAS, and upload to and download/stream from your NAS using an iOS or Android device on the go.
  • newegg User Quotas Divide the massive storage of a Thecus NAS among multiple users. Whether there are two users or 100, user quotas make it easy to divvy up and manage disk space.

Learn more about the Thecus N5550

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details

Customer Reviews of the Thecus N5550

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  • Michael G.
  • 11/17/2014 8:45:13 AM
  • Ownership: more than 1 year
  • Verified Owner

4 out of 5 eggsA 5-bay NAS that can also change your life?!

Pros: * 5 bays at a 4 bay price
* RAM is expandable, great if you run lots of modules
* Can double as a full-blown XBMC media center
* Great performance
* Tool-less case design
* Excellent build quality, but...**

Cons: * Cheap fan that dies, but is easily replaceable
* Can't rename default music partition from "iTunes_music"
* Yes, the webUI is kinda ugly, but it works well, so who cares
** Excellent build quality, but there are flimsy plastic parts, too

Other Thoughts: I originally bought this to replace my Acer Easystore H340 server, which ran Windows Home Server. This was a great solution for me, because it was able to run applications in addition to being a central NAS for our home and media collection.
But it was oh so slow...Eventually, I purchased the Thecus N5550 to take over the NAS duties, while the various apps (MySQL, Sickbeard, SabNZBD+) I ran on the Acer remained, although running very slowly...
After doing a little research, I found out that the Thecus website hosted these apps or "MODS" which could run easily on the NAS, so I gave 'em a shot. I have fully migrated all of my apps over to the Thecus, and they now run MUCH faster than they ever have on the Acer.
All-in-all, the Thecus is a powerful box, almost TOO powerful for a home, but it's also a super-capable machine capable of running a variety of apps.

Did you find this review helpful? Yes No

  • Anonymous
  • 9/15/2014 7:19:11 PM
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsGreat little NAS!

Pros: solid feel to it, very easy to set up, many options, dual gig nic. very inexpensive compared to other similar NAS devices. would absolutely buy it again.

Cons: can't think of any. I haven't had any of the problems any of these other people have had.

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  • Nancy R.
  • 9/6/2014 3:42:02 PM
  • Ownership: more than 1 year

5 out of 5 eggsGreat Home NAS

Pros: Fast, reliable, many useful features and only load the ones you want, quiet.

Cons: Bonded network link is slower than single link. (75Mbps vs 120Mbps)

Other Thoughts: I've owed this NAS for a little over a year and couldn't be happier. I particularly like ability to only load the modules you want/need.
I get almost full Gig-E transfers (120Mbps) with only a single cable connected. I'm running a blend of 2Tb WD Red's and Toshiba HDDs.
I use it as a both a NAS and media server, and easily playback videos directly to my HDTV.
If you're having speed issues check your network cables (you need minimum CAT5e for full GigE speeds), turn off any "green" features on the client side network interface and enable Jumbo Frames.

0 out of 1 people found this review helpful. Did you? Yes No

  • Maria G.
  • 1/16/2014 6:33:25 PM
  • Ownership: 1 day to 1 week
  • Verified Owner

1 out of 5 eggsjust bad all around

Pros: 5 bays
lcd display

Cons: door latch arrived broken
hd's wont spin down
unit wont sleep
fan is extremely loud
thecus support is horrible

Other Thoughts: had a cheap dlink 323 for my home media server
i bought bought this as an upgrade

right out of the box the door latch was broken so it wouldn't shut at all

the dlink with alt f has more features like power management and fan temp control
this unit is supposed to spin down after 30 min of inactivity and never spins down same wattage draw from my ups and same loud noise discs are always warm

i only access data a few hours a day if that hds spin 24 7 putting alot of un necessary wear and tear on my discs that i have about 600 dollars invested in
fan is super loud and the fan in the ps is loud also

thecus support is terrible i put a ticket in last week and after 3 days got one response from someone who doesn't have a grasp on the English language
and i been waiting for a reply three more days now

i thought id get some help on there forum
and tried to register after 3 days waiting for the registration emails (i tried with 3 different emails)
im still locked out from posting due to too many log in attempts

i would return this unit but new egg want me to pay to ship it 36 dollars plus a 60 dollar restock fee
im not paying 100 dollars and sending the unit back thats insane

lesson learned stay away from thecus all together
spend a few more dollars and go with a better company

hopefully they'll fix this in a firmware update before my wd red drives die from spinning 24 7

1 out of 3 people found this review helpful. Did you? Yes No

  • Gary Q.
  • 11/27/2013 3:20:17 PM
  • Ownership: more than 1 year
  • Verified Owner

5 out of 5 eggsGreat NAS

Pros: I own their older 4100Pro NAS and the 555 is much faster since it uses an Atom processor. I used 5 3TB Seagate drives with no issues. I used a RAID 5 config.

Cons: The door does not close well on mine.

Other Thoughts: The ones complaining about slow write speeds probably don't understand that RAID 5 always takes a write speed hit. Even high NAS drives do.

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  • Luke S.
  • 11/1/2013 11:34:10 AM
  • Ownership: 1 month to 1 year

5 out of 5 eggsAwesome for iSCSI

Pros: Great iSCSI box for Windows 2012 Hyper-V visualization. Solid box.

Cons: None

Other Thoughts: Can't get any better than this. Love this box and never have any problems.

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  • Tim H.
  • 10/20/2013 7:06:36 PM
  • Ownership: more than 1 year
  • Verified Owner

2 out of 5 eggsGood while it lasts

Pros: The unit looks nice, and the initial setup was pretty easy. I put 5x3TB drives in it as a raid six. Set up an ftp so I could access it remotely and in the first year I would have given it five eggs over two.

Cons: Several weeks ago I had the raid say a drive was bad. No big deal, I took the spare and put it in it's place and let it start rebuilding. After about halfway through the building of the replacement drive the unit locked up and dropped 2 more drives out of the raid. I managed to get one to be recognized and worked hard to get all the things not backed up off of it. Then after reading an post on the forums I updated the firmware and it picked up the other drive that had been dropped. After several weeks of trying various things, I came to the conclusion the raid controller had an issue and would crash whenever streaming video or music off of it to a local machine. The part I'm really annoyed with is the lack of rma process. Take it to a local repair center..which has no link on the site to repair centers. The eticket I opened was ignored, and I'm pretty sure I'm not going to be able to get it fixed. I might if I pay shipping both ways to where it is that they make them.

One of the things not listed on the specs is that the raid is an SIIG, which if I would have known I would have not gotten it. I've been burned by SIIG every time I've used one of their products....this is no exception.

Other Thoughts: I've since build my own nas and using all the drives I took out of the unit have tested to be 100% ok by the hd tools from the manufacturer, and they've been running like a dream for several weeks. So that pretty much verifies the controller has a problem. I guess Thecus goes on the never again list.

5 out of 5 people found this review helpful. Did you? Yes No

  • Jeffrey C.
  • 9/16/2013 1:51:24 PM
  • Ownership: 1 day to 1 week
  • Verified Owner

1 out of 5 eggsWrite Speed Sucks

Pros: RAID easy to setup. Cool features although was very dissatisfied with the write speed. Seems like a hit or miss depending on what post on the Internet you see.

Cons: GUI has and old feeling. Write speed is slow, there are tons of issues like these within their support site. Updated the firmware to see if that would resolve the issue and it did not. Usually if you have a Gig connection, it goes faster that 22MB/s. Returned this product to get a credit back on my account. I was to run VMWare Machines on this thing and I dont feel as though I should wait forever to create a machine, so I decided to return it today!

Other Thoughts: Don't be fooled by the cool features of this box. STAY AWAY!!!!!!!!!

0 out of 1 people found this review helpful. Did you? Yes No

  • Garland M.
  • 8/18/2013 7:33:17 PM
  • Ownership: 1 week to 1 month
  • Verified Owner

1 out of 5 eggsAwful support/Bad Product

Pros: Hardware is rock solid. There aren't many NAS's you can buy on the market for this price with the hardware that this unit has.

Cons: Hardware is nothing if the software is garbage!
Support is pretty much non existent!
Web UI is buggy!
Every change in the web UI causes a reboot, which means downtime!

Other Thoughts: This device looks good on paper but doesn't function as advertised. It says it integrates with Windows Active Directory but its not reliable. If the device isn't connected to port 1 it will lose connection to Active Directory. Setting folder permissions with Windows ACL doesn't work. So if you are looking to secure files for Windows users stay away from this device. I waited an entire week for support to respond to me and they still were unable to resolve the issue for me. I don't think they really cared in the first place. Also the device was physically defective when I received it so I had to return the unit. I don't think this is a good product to use for power users who want to control access to their data.

0 out of 1 people found this review helpful. Did you? Yes No

  • Alex P.
  • 5/30/2013 3:54:24 AM
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsSolid NAS, Fast

Pros: Worked out of the box. I found it easy to use and fast. I have 5 seagate 4TB drives running in raid6. I get 100+MB/s on large file trasfers with the processor only hitting 50% or so.

Cons: Not a big deal, but could have included a second ethernet cable...

Other Thoughts: Mine is in the basement, so noise is a non-issue for me.

Also, if you do use drive >2TB would recommend raid 6 or raid 10 as the larger drives appear to fail more frequently than the smaller sizes for some reason.

I was interested to see the logs showed someone at the factory plugging in drives to test each bay

I had to update the firmware before I could use the drives

5 out of 5 people found this review helpful. Did you? Yes No

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Network Attached Storage (NAS) > 
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Thecus > 
Item#: 9SIA0AJ1UJ9838
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