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QNAP TS-421 Diskless System Network Storage

  • 4-Bay
  • Diskless System
  • Marvell 2.0GHz Processor
  • 2 x 10/100/1000M
  • 2 x USB3.0 + 2 x USB2.0
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Powerful yet simple

The TS-421 comes with powerful hardware for amazing processing performance. Together with the new QTS 4.0 operating system, you can enjoy convenient data backup, cross-device synchronization, easy home entertainment, and remote access to the Turbo NAS anytime and anywhere.

Superior Performance

Powered by the Marvell ARM 2.0 GHz processor, the TS-421 provides a large storage capacity for archiving files, videos, and music. The TS-421 can handle multiple users accessing the system and multiple applications running at the same time. USB 3.0 ports are also included for high speed data backup to external drives.

Easier Operations on QTS 4.0 Desktop

The QTS 4.0 Desktop including quick start menu, graphic dashboard, drag-and-drop icons, multiple desktops, personalized wallpapers, and the smart toolbar make system operations much easier. In addition, multi-tasking is supported which allows multiple windows to be open to access multiple applications concurrently.


Easy System Set-up Without Using a CD

Installation process is done completely through the cloud. Simply visit the set-up portal,, follow the guide to complete the system set-up and download the utilities you want. That’s it, your TS-421 is ready to go!

App Center - A Whole New Experience

The App Center centralizes various apps developed by QNAP and third-party developers. Popular apps such as Google Drive, Plex media server, NZBGet, Python, and more are available in the App center for you to enhance your TS-421 experience. Installation is virtually immediate, with just one click the App will start installing onto the NAS.

Freely Access your Cloud Anywhere

All of your content is available on the go! Through any Web browser or the free app for tablets and smartphones the TS-421 becomes your personal cloud so you are always connected to your data. Take advantage of the service, which allows you to remotely access your TS-421 wherever you are. Instantly stream or share your multimedia content and share itwith your friends.


Manage various files with upmost productivity

The Turbo NAS provides powerful File Station to manage all kinds of files, and supports seamless file sharing among computers of different operating systems. Feel confident that all the files are well organized, under your control, and easy to be shared.



Connecting multimedia content in modern homes

No worries about the tons of photos, music, and videos stored in different places and on different devices at home. The Turbo NAS features rich multimedia applications including photo station, music station, video station, TV station and HappyGet, and acts as a home multimedia "hub" for storing files and easily playing and sharing them with others. The Photo Station makes photo sharing simple, and you can designate your own access right controls. The Music Station helps categorize your music collection, and displays album covers to easily organize your personal playlists. The Video Station is great for archiving and playing your personal video collection online. Insert the DVB-T USB TV tuner into the Turbo NAS, and then you can log onto the TV Station web interface to watch or record digital TV shows immediately, anywhere in the house. The HappyGet helps to easily back up YouTube and Vimeo videos or Facebook photos to the Turbo NAS and supports music playlist, all within the Chrome web browser.

Stream TV content your way!

From DLNA, to AirPlay, simply choose the way you prefer to stream your TV, then sit back, relax and enjoy your video collections on TV. The Turbo NAS is a full media center with DLNA support. You can use DLNA-compatible devices such as HDTV sets, Sony PS3, Microsoft Xbox 360 and Hi-Fi system to enjoy videos stored on the Turbo NAS. The TS-421 even supports Apple AirPlay. You can enjoy video and multimedia contents on AirPlay supported devices. You can also use the TS-421 as a PLEX media server and enjoy your content through any Plex client or Smart TV.



Cross-device file synchronization is a breeze

You have a desktop, a laptop, and a smart phone. You work in an office, at home, or sometimes in a coffee shop. Now, the Qsync utility enables you to sync your files anywhere in a snap. You don’t have to manually copy files from one device to another to get the latest version of your files anymore. Qsync is especially useful for frequent travelers to manage files and always have the most updated files on different devices. Qsync provides multiple ways of file synchronization and group file sharing, greatly enhancing the flexibility of collaboration.



Access, Manage and Enjoy with your Tablets and Smartphones

The TS-421 is your private cloud storage that virtually enlarges the capacity of your smart mobile devices. Qfile allows you to access, upload, download, manage, and share stored files easily as if you are carrying tons of files in your pocket. Music, photos and videos can be streamed, enjoyed and shared anytime, anywhere. Qmanager lets you monitor and manage the TS-421 remotely and efficiently without turning on a PC.


Interact Through your Favorite Social Media Sites

Many applications on the TS-421 are designed with friendly options allowing you to share and connect with your social media communities. When you use Photo Station, or Video Station, you can pick and share photos and video links directly to Facebook. DJ Station allows you to stream and share your music playlist with your friends and family on your social media platforms.


Surveillance Station Pro - Protect your Home and Valuables

The Surveillance Station Pro brings home surveillance to the TS-421. The TS-421 becomes a professional surveillance station to view IP cameras from your web browser and mobile devices. Support for over 1,000 IP camera advance features is also included with the Surveillance Station Pro software, such as real-time monitoring, recording, and playback. With the user-friendly interface and the expandable IP camera channel licenses, Surveillance Station Pro builds a professional surveillance center for you to monitor your valuables.


Data Security

User Access Controls
Easily set up user accounts, user groups, shared folder access right, and user quota

Unauthorized IP-based Blocking
A comprehensive list granting proper access from different users based on IP address can be established to authorize or deny access to the TS-421.

The TS-421 has a built in anti-virus feature to detect and protect against viruses, malware, worms, and Trojan horses.

Encrypted Login, Access and Network Transfer
SSH remote login, SSL security (HTTPS), Secure FTP, and encrypted remote replication are supported.

Detailed Logs
Detailed logs of file-level access to the TS-421 via different file transfer protocols, and services accessed by online users can all be recorded.

Expandable Storage

The TS-421 supports a large storage capacity, fulfilling the increasing demand for storage. It supports comprehensive RAID management and online RAID capacity expansion appropriately storing important data and reducing risks of data loss.

All-in-One NAS Server for Home and SOHO

The TS-421 brings you extra with all-in-one home server features, e.g. iTunes server,UPnP media server, backup server, printer server, FTP server, Web server, database server, etc.

Eco-friendly Design

The TS-421 is designed to be eco friendly, and to help you save on your electricity bill. The smart fan can automatically adjust its speed based on system pre-defined criteria or a specific temperature. Use the hard disk standby mode if there is no disk accessed within the specified period, lowering energy consumption and extending the lifespan of the hard disks. The Turbo NAS can also be setup to automatically power on, off, or reset.


Learn more about the Qnap TS-421

Quick Info


  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year

Customer Reviews of the Qnap TS-421

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  • Joyce V.
  • 10/20/2014 9:27:33 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

4 out of 5 eggsWorking very well now

Pros: The support team identified the problem as a bad firmware update and walked me through how to reapply it. I can verify this was the issue since some things was missing that are there now even though the firmware version said the same number. From that point, the unit has been running solid and I have been backing up 27 desktops and 12 laptops and 3 servers every night without a problem.

Cons: should put some kind of crc checksum while doing the firmware update. The user can never tell if things don't get applied completely.

Other Thoughts: Because of the bad firmware update, this almost got RMA. Fortunately the support team was on to of it and narrowed it down within a day of my call.

Did you find this review helpful? Yes No

  • Joyce V.
  • 10/17/2014 12:09:26 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

3 out of 5 eggsRandom Reboots Copying Large Files Follow Up #01

Pros: +1 For the tech support. Better then average that's for sure.
"according the log we found this seems nas firmware incomplete, please try steps bellow to update again" etc, etc.

We have been back and forth in emails and will try the backup again once the raid is finished syncing.
I had already requested a RMA, but will hold off a bit longer to see if this does the trick :)

Cons: With every random reboot it has to resync taking several hours. I surely hope this is the last one.

Did you find this review helpful? Yes No

  • Joyce V.
  • 10/16/2014 1:34:28 PM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

3 out of 5 eggsRandom Reboots Copying Large Files

Pros: The amount of features this unit has is endless. I am very impressed with features of the unit.

Cons: I use Acronis Server backup and have had multiple random crashes while creating the large backup files. Usually anywhere from 8 gb to 40gb on the average. Tech support logged in and shutdown just about every service since I only need to to do backups to shared folder. No less then an hour later it's rebooting again. Back on the phone with tech support again. They poked around and couldn't find anything wrong. Made a diagnostic file to send the the support team to try and figure it out. Each drive is brand new WD 3TB RED and has been tested previously to install of bad sectors. Of course the firmware has been updated already.
Basically at this point they want a couple days to look at the diagnostic file. Originally they wanted me to remove the drives and let it sit for a couple days to see if it reboots.
I have 27 desktops and 14 laptops and 2 servers that need backing up daily and can't afford that kind of downtime. It's a shame I am going to have to RMA this device and will probably shoot for a different Manufacturer altogether rather then take the chance of getting another unreliable unit.

Other Thoughts: This would have gotten a 5 if not for the reliability. My 8TB WDSharespace from 2007 works better then this thing has in 4 days time.

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  • steven r.
  • 7/23/2014 6:23:49 PM
  • Tech Level: Average
  • Ownership: less than 1 day
  • Verified Owner

3 out of 5 eggsquestionable pt 2

Pros: Seems that the failure of the networking on my last set was due to the first NAS 1/2 formatting the drives partially before it claimed a bay was bad. Seems I need to start it with all drives out of device, let it attach to network then reinitiallize everything. Fun Fun. Bright side, it isn't hardware failures for both NAS's, just a failure to properly attach to network (and constant rebooting) if the drives are not right.

Cons: No manual with the device to tell me such wonderful setup problems, requires a call to QNAp, who actually have fairly good hours and polite assistance.

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

  • steven r.
  • 7/13/2014 2:05:52 PM
  • Tech Level: Average
  • Ownership: less than 1 day
  • Verified Owner

1 out of 5 eggsQuestionable

Pros: Reasonable price for what it says it can do.

Cons: Well....I bought 2, neither worked. One kept swearing bay 4 drive was bad, even when I shuffled drives, still bay 4 bad. Also, one ethernet port refused to connect. The other, both ethernet ports refused to connect.

I have sent both back on an RMA, so that's another $40 I have spent for them. If the replacement pair is just as bad, well, at least I will have only spent $80 on junk and can then maybe buy a NAS that works.

Time will tell, maybe next set will be perfect and those 2 were flukes...

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

  • 12/15/2013 6:53:18 PM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsVery nice

Pros: Great personal storage solution. It has met everything I needed. Very easy to setup. After setup I have not seen any issues with speed. The interface is very easy to use. The extra apps are mostly useless, but I'm sure there are some people that they will use them. I tried the plex app, but it won't do any transcoding when installed directly on the qnap. Makes sense as there is just not enough processor and memory. Overall very happy with this device.

Cons: Not much. I did set it up with 4 3TB WD red drives in a raid 10. It took more than 24 hours to get the array fully online. That seemed a bit long to me.

Other Thoughts: Great storage device for home use.

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

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