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NETGEAR ReadyNAS Ultra 4-bay (2x2TB) w/ 3 yr warranty

  • 4-Bay
  • 4TB (2x2TB)
  • Intel Atom single-core processor Processor
  • 2 x 10/100/1000M
  • 3 x USB2.0
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The Netgear RNDU4220 is a half-populated NAS storage device with 2 x 2TB hard drives and 2 empty disk trays. Using X-RAID2 automatic volume expansion technology, you can expand their volumes on-the-fly simply by adding new hard drives or replacing lower capacity drives with higher ones at a later date. The RNDU4220 is Netgear’s newest 4-Bay multimedia desktop storage system with both NAS and iSCSI SAN support. It provides 2X the performance of the current models (over 80 MB/s), X-RAID2 automatic volume expansion technology, secure drag-and-drop remote access (ReadyNAS Remote), optional online backup and recovery service (ReadyNAS Vault), and RAID 0/1/5 for data protection. It will also include some new software applications from TiVo, Orb and Skifta.

The Netgear RNDU4220 is designed for advanced home users (prosumers) who have large digital media libraries (music, photos, videos) and require maximum performance in order to run their bleeding-edge applications concurrently. It’s ideal for media enthusiasts looking for a fast, high-quality yet affordable storage solution to store, share and protect their equally high-valued media collections. Get the Netgear RNDU4220 today and enjoy unbridled file access anytime, anywhere.

  • newegg High Performance Featuring powerful but energy-efficient 1.66 GHz Intel Atom processor, 1GB DDR2 RAM and over 80MB/s throughput, the Netgear RNDU4220 can tackle the ultra heavy application with power to spare.
  • newegg iSCSI Target Support Netgear’s iSCSI target support enables connectivity to remote storage devices over a standard IP network, regardless of where the device resides; in the next room or on another continent.
  • newegg Data Protection The advanced RAID system with support for RAID 0, 1, and 5 continually checks hard drive performance to ensure data integrity.
  • newegg X-RAID2 Technology The Netgear’s X-RAID2 technology can manage volume expansion automatically as you add new hard drives or replace existing drives with larger capacity drives.
  • newegg ReadyNAS Remote & ReadyNAS Vault The ReadyNAS Remote technology provides you with secure drag-and-drop remote access without complicated network setups, and the ReadyNAS Vault technology can help you backup critical files off-site for added security and peace of mind, then access and restore them remotely online.
  • newegg Best Software Partnerships With the new software application from TiVo, Orb and Skifta, the Netgear RNDU4220 can also perform as TiVo compatible DVR network archiving and storage device, Orb powered storage with transcoding capabilities, media shifting storage device with Skifta (access multimedia content while you’re away on any connected DLNA devices), perfect for you multimedia entertainment.

Learn more about the Netgear Inc. RNDU4220-100NAS




Port RJ-45
2 x 10/100/1000M
Port USB
3 x USB2.0
HDD Interface
4 x SATA (4 x Bay)


Form Factor
Intel Atom single-core processor
Default/ Max. Memory

Hard Drive Performance

Included HDD Capacity
4TB (2x2TB)
RAID 0, 1, 5 and JBOD


Supported Protocols
CIFS/SMB for Windows
AFP for Mac OS
NFS for Linux and UNIX
HTTP/S for Web browsers
FTP/S Support
Volume Management
- X-RAID2 auto volume expansion technology
- Multiple volume support for RAID 0, 1, 5
- Journaling mode
- User, group, and share-level quotas
- Built-in iSCSI target service


120W server-rated AC power supply
Input: 100-240V AC, 50/60 Hz


X-RAID2 - Manage volume expansion automatically as you add new hard drives or replace existing drives with larger capacity drives.

Delivers over 80 MBps throughput

ReadyNAS Remote - Get secure drag-and-drop remote access without complicated network setups.

ReadyNAS Vault - Backup critical files off-site for added security and peace of mind, then access and restore them remotely online.

Rsync - Replicate and synchronize files between two ReadyNAS devices.

TiVo Compatible - Store your favorite television and stream them back to any TiVo DVR in your home.

Media Shifting with Skifta - Access multimedia content from your ReadyNAS while you're away from home on connected DLNA devices.

Transcoding with Orb - Convert multimedia content for optimal streaming on mobile devices.

Automatic Backups - Back up three computers (PC or Mac) continuously using Memeo Premium Backup and restore any previous version of a file with a simple right-click.

For the Hard drives compatibility, please go to

The firmware that is needed for Netgear NAS products to be compatible with 3TB drives (assuming it did not come with a 3TB drive) is RAIDiator 4.2.17. For more details, please go to this link below to download this software.

Please visit the following link to get the latest software for your ReadyNAS product.
Ultra high prerformance for large number of users

Dimensions / Weight

8.78" x 8.07" x 5.28"
10.35 lbs. without disks


0°C - 40 °C
20-80% Humidity (non-condensing)

Package Contents

Package Contents
ReadyNAS Ultra 4 (RNDU4220)
4 Hard Disk Trays (with 2 x 2 TB HDD and 2 empty trays)
Install Guide
Warranty Card
Power Cable
Ethernet Cable
ReadyNAS Installation CD
- ReadyNAS Discovery Utility
- Online User Manuals (Software / Hardware)
- (3) Memeo Premium Backup software licenses for Windows and Macintosh
16 screws for future HDD installation

Manufacturer Warranty

3 years limited
3 years limited

Quick Info


  • Limited Warranty period (parts): 3 years
  • Limited Warranty period (labor): 3 years

Customer Reviews of the Netgear Inc. RNDU4220-100NAS

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  • Randy S.
  • 8/10/2012 7:26:33 AM
  • Tech Level: High
  • Ownership: 1 month to 1 year
  • Verified Owner

5 out of 5 eggsCouldn't be happier

Pros: Easy Peasy. I don't understand why people buy the drobo when this is out there. It's raid is much more reliable, and the features are anything you could want. I can stream pictures/movies/etc to my Blu-Ray player, backup 3 Macs using TimeMachine, and not have to worry. I use this to backup my pictures and r-sync to my website without issue as well.

Cons: The GUI interface is a little kludgey. Effective, but it's not the best. Drive's including are Green. While not a deal killer by any means, they are fairly quiet. So if you are looking for the MAX speed possible, keep in mind these are 5900RPM drives.

Other Thoughts: I make a living supporting NAS (EMC Celerras) and looked at a bunch of others. Synology, Drobo (ugg), IOmega, and some of the smaller players, and this one was the best of the mid range in my opinion. The drives aren't the fastest, and there are features that others may have, but for my needs, this one fits the bill just right. Adding drives couldn't be easier (it even emails you letting you know when the re-striping is complete)

Did you find this review helpful? Yes No

  • Edward U.
  • 4/20/2012 6:32:04 AM
  • Tech Level: Somewhat High
  • Ownership: less than 1 day
  • Verified Owner

1 out of 5 eggsnear dead on arrival, and no one to call

Pros: The install was a snap, down loading was easy to it, conecting from other divices was simple

Cons: In less than 24 hours disk 1 had 460+ sector errors, Disk two has a status of dead. My issue is that there is no longer a phone number for newegg and the chat support is down. Is NewEgg going out of business?

0 out of 4 people found this review helpful. Did you? Yes No

  • Moniko M.
  • 10/31/2010 10:20:31 AM
  • Tech Level: High
  • Ownership: 1 day to 1 week
  • Verified Owner

4 out of 5 eggslots of features

Pros: Lots of features, easy configuration. I can't verify the speed yet, but it connected with 1 Gb to my Netgear RangeMax (WNDR3700) router. The Tivo setup is very cool and it works as advertised. So does iTunes server. Plenty of space to increase storage. The unit comes pre-set up with X-RAID2.
Very compact and quite unit, especially if you set the disks to spin-down.

Cons: The price is a little steep. The unit comes with 2 Seagate Barracuda LP ST32000542AS 2TB which newegg and others sell for $99.99. The diskless unit - NETGEAR RNDU4000 Diskless ReadyNAS Ultra 4 sells for 599, so you will pay $100 premium for the disk installation.

Other Thoughts: I took the advise of others to have Netgear router, so I don't have compatibility issues.
newegg lists 1 year warranty- Netgear site says 3 years.
I did research lots of NAS storages, and Ultra 4 & 6 are the only ones that have seamless integration with Tivo- for me that was huge.
I still have to test the remote features and the hot-swap- I have to force myself to do that. Also, I don't have any experience regarding the reliability- have had it for 3 days only, will post if I have problems
If it wasn't expensive this NAS deserves 5 stars, hands down.

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

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