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NETGEAR ReadyNAS Ultra 4 (4-bay, diskless) Network Attached Storage, latest generation RNDU4000

by Netgear
3.9 out of 5 stars 32 customer reviews

Available from these sellers.
ReadyNAS Ultra 4, Diskless (0TB)
  • Blazing fast performances for bleeding-edge applications
  • Best software partnerships to provide best store and serve user experiences
  • First TiVo compatible DVR network archiving and storage device storage device
  • Continuous backups from PC/Mac with Memeo Premium Backup
  • Built in iTunes Server
1 new from $438.50 2 used from $280.00

Product Description

Style: ReadyNAS Ultra 4, Diskless (0TB)

Product Description

The NETGEAR ReadyNAS Ultra series deliver the power you need to run bleeding-edge applications and the flexibility you want to store, share and protect your prized multimedia collections. Two Gigabit Ethernet Ports deliver ultra-fast connections, while three USB ports offer the flexibility for users to connect other devices with a USB connection (e.g., printer servers, external USB storage devices or digital cameras). These multimedia desktop storages are ideal for media enthusiasts with large digital media libraries who want to take their media files wherever they go. X-RAID2 - Manage volume expansion automatically as you add new hard drives or replace existing drives with larger capacity drives. 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 - Archive your favorite television programs and play 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.

From the Manufacturer

Designed for advanced home users, the NETGEAR ReadyNAS Ultra 4 Home Media Server enables you to store, share, and protect your digital media files and access them easily across all of your networked devices, including your TiVo. The ReadyNAS Ultra 4 runs up to three times faster than the ReadyNAS NV+. It comes equipped with four drive bays and NETGEAR data-backup services.

NETGEAR ReadyNas Ultra
The ReadyNAS Ultra 4 has four drive bays for expansion. View larger.
Store and Share Your Digital Media with Ease

The NETGEAR ReadyNAS Ultra 4 makes it easy for people with large digital media libraries to take their media files with them wherever they go. Featuring robust processing power and energy-efficient Intel architecture, the device can run cutting-edge applications and deliver the flexibility to store, share, and protect your multimedia collection.

NETGEAR ReadyNas Ultra

Specifically, it enables you to take music, videos, and other media with you anytime, anywhere, and on any screen. The Ultra 4 is DLNA-certified, which means that you can use it as a media server to stream your music, photos, and videos to any networked device within your home, including your TiVo box. You can also record your favorite shows using your TiVo DVR, back them up with your Ultra 4, and watch them whenever you want.

A pair of gigabyte Ethernet ports delivers exceptionally fast connections, while three USB ports offer the flexibility to connect other devices with a USB connection, such as printers, external USB storage devices, or digital cameras.

Stream Content to Your Mobile Device

NETGEAR ReadyNas Ultra
NETGEAR ReadyNas Ultra

The Ultra 4 will also allow you to shift your media and stream it to any remote DLNA-rendering device using Skifta technology. Simply download the Skifta client, create your place, shift your media, and press play.

NETGEAR ReadyNas Ultra

Using the free streaming software, Orb, home users can stream their media content inside and outside the home over a Wi-Fi or 3G/4G connection. Orb allows the Ultra 4 to transcode multimedia files on the fly, and stream them to a mobile device. All you need is the Ultra 4, an Internet or 3G/4G connection, and a handheld device with the Orb Live app* installed.

Multiple Layers of Data Protection

NETGEAR ReadyNas Ultra

The Ultra 4 offers multiple layers of protection for your multimedia data. ReadyNAS Vault--a unique, cloud-based backup service--allows you to customize your own disaster recovery plan. In the event of disk failure, a virus, or another disaster, the service will restore your most critical files with a simple click. The Ultra 4 ships with 2 GB of ReadyNAS Vault services included for two years.

Access the ReadyNAS Ultra 4 Remotely

Using the ReadyNAS Remote** feature, you can drag and drop files on your Ultra 4 remotely without complicated network setups. In addition, the Ultra 4 comes with an Rsync service that allows you to replicate and synchronize files between two ReadyNAS devices.

The Ultra 4 is a diskless device, so you can install your own drives and add whatever capacity you need. It features bay space for four drives, and it can accommodate most 3.5-inch SATA drives. X-RAID2 technology makes it easy to replace existing hard drives or add new ones.

NETGEAR ReadyNas Ultra

NETGEAR also offers a two-bay diskless version of the ReadyNAS Ultra; a two-bay version with a preinstalled 2-TB hard drive; a two-bay version with two preinstalled 2-TB hard drives; a four-bay version with two preinstalled 2-TB hard drives; a six-bay diskless version; and a six-bay version with three preinstalled 2-TB hard drives.

The ReadyNAS Ultra 4 Home Media Server is backed by a three-year NETGEAR hardware warranty.

What's in the Box

ReadyNAS Ultra 4 Home Media Server.

*Orb Live app is sold separately on iTunes. The app is compatible with the Android and the iPhone/iPod/iPad.
**ReadyNAS Remote app is sold separately on iTunes. The app is compatible with the iPhone/iPod/iPad only.

Product Information

Style:ReadyNAS Ultra 4, Diskless (0TB)

Technical Details

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Summary : Screen Size, Screen Resolution, Graphics Coprocessor, Graphics Card RAM
Hard Drive 4 TB Desktop
Brand Name Netgear
Item model number RNDU4000-100NAS
Item Weight 12.9 pounds
Product Dimensions 8.9 x 11.2 x 12.9 inches
Item Dimensions L x W x H 8.9 x 11.2 x 12.9 inches
Processor Brand Intel

Additional Information

Customer Reviews
3.9 out of 5 stars 32 customer reviews

3.9 out of 5 stars
Best Sellers Rank #631 in Electronics > Computers & Accessories > Data Storage > Network Attached Storage
#14,576 in Electronics > Computers & Accessories > Networking Products
Shipping Weight 13.1 pounds
Domestic Shipping Item can be shipped within U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available July 12, 2010

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
Product Warranty: For warranty information about this product, please click here

Customer Reviews

Top Customer Reviews

Style Name: ReadyNAS Ultra 4, Diskless (0TB) Verified Purchase
It has been a while since I've gotten a new NAS system, and I am totally impressed with this unit. It has been almost totally painless. Now all the computers at my house can have plenty of backup storage, and easily share all the data, video, photo, and music files you are likely to have.


I am a Computer Engineer - been in the field for 35 years, so I'm fussy about my hardware. I have a house hardwired with CAT5 plus a WiFi router. The main machines are Macs, but there are some Windows computers too. This unit supports Time Machine - and the support works perfectly and painlessly. I also have a couple of DLNA media devices, so that is an important feature. The ReadyNAS also lets you plugin USB drives and they instantly become available on the network as well - so all my old external USB drives are not useless with this upgrade.

THE GOOD (Great, actually)

* This device is as close to plug and play as I've seen in a long time. There is a somewhat lengthy setup - but we're dealing with Terabytes of disk space that has to get organized and set up properly for the X-RAID striping.

* You can plug in new drives to expand capacity as needed.

* Works seamlessly on a mixed Mac/Windows/DLNA media environment

* Redundant storage keeps going even after a single disk failure. I feel all my photos and videos are now safe (although I still keep an extra off-site backup, just in case.)

* Fast - almost as fast as a directly connected USB, but now available to all the computers in the house.

* Can install extra software to securely access your data from the web anywhere.


* There is a setting on the Network Interfaces called MTU.
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Style Name: ReadyNAS Ultra 4, Diskless (0TB)
I'm a network engineer and I chose the diskless because I wanted to control my drive specs.

In general avoid power-saving, "green" drives. There have been a lot of issues and power-savings translates into slowdowns managed by the drive's internals. Similar to how CPUs lower power consumption and heat by slowing down. If you want speed, green is not a "go".

I bought 2 x 2tb 64mb cache drives. I have a third, same spec at home, which I need to migrate data off first.

I plugged the Netgear into the Verizon FIOS wireless router(six 100Mb LAN ports) and my laptop was plugged into this. I transferred 500 Gb of data to the netgear and it sustained just about 80 mbps network transfer rate across the network. That's about what you can hope for on 100MB. Depending upon switch & pc hardware and transfer protocol I have seen higher, but often highspeed transfers max out at the 80% mark. Once I bring a gig switch to the house I'll see if I can push further. At some point I will max out read or write. Just not sure when and whose limits.

The Apple streaming support is there. I-Tunes found my 20,000 song library on the netgears. My shares automatically showed up on Macs. Windows mapped without issues. None of the playlists work anymore though. And information is missing or wrong. DLNA worked, but I don't have a good DLNA client. I think my blueray player may have some capability there. I'll update once I get it wired up to the network. I don't have a TIVO to test out Tivo support as well.

Unlike complaints of the lower end model, the admin interface on the Ultra is quick and responsive. I showed the unit to an earlier model ReadyNAS owner and they see a big difference.
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Style Name: ReadyNAS Ultra 4, Diskless (0TB)
I've had the ReadyNAS Ultra 4 for over a year and it has operated flawlessly. Started w/ 2 drives and once they were full popped in a third unformatted disk and it was automatically formatted and data re-striped without incident. Last week my 3 drives reached capacity and I popped in a 4th which was automatically formatted and all 4 drives again re-striped without incident. With the current firmware, you can now plop 4 3TB drives in this box (12TB total raw capacity). With conventional mirroring, that would give you 6 TB of fully redundant capacity. With Netgear's XRAID striping technology you actually would get around 8.25TB of fully redundant capacity.

The NAS allows you to configure an email address and it will automatically send you an email when appropriate (e.g. h/w problem, reboot, firmware updates available, nearing full capacity, etc.). I have applied several firmware updates as they have come available and experienced no update issues.

Finally, the ReadyNAS forums are extremely helpful and full of very sharp people that have been very helpful in answering technical questions.
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Style Name: ReadyNAS Ultra 4, Diskless (0TB)
I've been using this unit with 4x 2TB hard drives for four months now, and it has performed flawlessly. The user interface software (RAIDar) is incredibly easy to use, and I had no trouble setting the unit up just the way I wanted it. I use it to share files over a wireless home network with 3 laptops, 2 smartphones, a DLNA TV and a DLNA DVD player. I had no trouble whatsoever getting these devices connected to the NAS.

I especially like the power saving features - I set the unit to turn off at midnight and back on at 7 a.m. No sense leaving it on while I'm sleeping. You can fine-tune this feature to set different on/off times for each day of the week. I also set it to "spin down" the hard drives after 10 minutes of idle time. That way they are resting and not using much power if I'm not on the network.

I also like that the unit will email me with problems or updates about completed backups, etc. It will also communicate with my battery backup so it knows when the power is out and can take appropriate actions to shut down when the battery is low. Finally, there are a lot of add-ons (basically, "apps") that you can download to expand the functionality of the unit. I've found several of these to be useful.

The drawbacks are that this is not a cheap piece of equipment, especially if you add four big drives. I will also agree with the other reviewer who said that the concept of "shares" could be explained better.

The bottom line: I was willing to pay for a reliable NAS that worked well and didn't require constant tinkering to keep working. This NAS fits that description for me. As the saying goes: "Buy quality, cry once; buy cheap and cry often."
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