Review: Netgear ReadyNAS Duo RND2150 (500 GB) - Page 2

By Joseph Moran
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File and Media Support

The Duo supports an alphabet soup of file protocols for shared folders (e.g., CIFS, NFS and AFP) covering Windows, Mac, and Linux or Unix clients. (We successfully accessed the Duo with XP, Vista and Ubuntu 8.04.) For getting at files over the Internet the Duo also provides access via FTP or HTTP, but since neither of these are secure protocols we appreciate the HTTP/S support, which allows you to access the Duo via an SSL-encrypted connection. When setting up a shared folder you can assign read-only or read/write access to users and groups, or enable access from specific IP addresses.

In addition to standard file sharing, the Duo includes sever software to stream various media to a variety of devices. This includes a Slim Devices' SlimServer for sending music to a Logitech Squeezebox; Firefly Media Server, an open-source server that can stream to iTunes or a Roku Soundbridge; and a UPnP AV server to stream music, photos and video to compatible media players. We had no trouble accessing music stored on the ReadyNAS via iTunes or streaming audio/visual content to an Xbox 360 and a PlayStation 3.

Data Redundancy and Capacity Upgrades

Since the Duo comes with a solitary hard drive out of the box, there's no data redundancy until a second drive is added. Fortunately, that's not difficult to do. The Duo's front panel swings open to reveal a pair of slots — pressing a button and pulling the latch on the second slot removes an empty drive tray. Adding a new drive (standard internal SATA) isn't quite effortless since you must mount the drive in the tray using four supplied screws, but there are no data or power cables to mess with.

Since the Duo supports hot swapping, you can add a drive without first powering down the unit. The Duo also allows you to add the second disk without disturbing the contents of the first one thanks to a technology Netgear calls X-RAID (X as in "eXpandable"). The catch, if you can call it that, is that X-RAID doesn't enable you to increase your usable storage capacity by aggregating the capacity of both disks (RAID 0). Rather, it provides redundancy for current data by automatically mirroring it onto the second drive (RAID 1). For this reason, the second drive's capacity must be at least equal to the first; when one drive is larger than the other, the excess capacity goes unused.

This isn't to say that you can't increase the capacity of the ReadyNAS. If you add a second disk with more capacity than the first — say, add 1 TB disk to a 500 GB Duo — you have the option of repeating the procedure down the road by replacing the 500 GB disk with a 1 TB model, at which point you'll have a full 1 TB of usable storage. This is a somewhat circuitous upgrade path and not necessarily the most cost-effective since you're initially paying for unused capacity. On the other hand, anyone with growing storage needs will appreciate that the Duo offers an upgrade option that doesn't involve offloading data somewhere to replace drives.

When we added another 500 GB drive to the one already in the Duo, it took about two hours and 40 minutes rebuild the volume so data was protected. You can continue to access the Duo during this process, and there was no especially noticeable slowdown while doing so. Once the second drive was fully initialized, we removed the original drive to simulate a failure, and all the data on the Duo was still accessible. After reinserting the missing drive the volume began its rebuild process anew, again taking just shy of three hours to complete.

In some respects, the X-RAID-based Duo is similar to Data Robotics' Drobo in its ability to add fault tolerance and non-destructively add capacity, although the latter supports four drives of mixed capacity disks. (On the other hand, the USB/FireWire-based Drobo needs an add-on device to become a NAS.)

Netgear recommends using two of the same model hard drive with the Duo for best results. (Our extra drive was a Seagate Barracuda provided by Netgear.) A list of hard drives — as well as USB printers, storage devices and other peripherals — compatible with the Duo is here.

The Duo's OS allows the installation of add-on components, and the device includes two of them. One is a built-in BitTorrent client that lets you download torrents directly to the Duo sans PC. The other is ReadyNAS Photos, which lets you share photos on your Duo with others as an alternative to Web sites like Flickr. To use it you must install a PC-based utility to create albums out of your stored photos and then send out invitations to view them. It's interesting, and some will undoubtedly find it useful, but we'd much prefer it worked autonomously off the Duo rather than be dependent on a PC.


At $400, the Duo's price tag isn't insignificant, especially since you must shell out for another 500 GB hard drive (around $80 purchased online) to get redundancy. Nevertheless, there's much to like about the Duo, including hot-swap drives, support for disk quotas, and excellent media streaming capabilities. Despite some irksome interface issues, the Netgear ReadyNAS Duo RND2150 is a powerful and versatile network storage device for a home or home office environment.

Product: Netgear ReadyNAS Duo RND2150
Price: $399.99 (MSRP)
Pros: Provides secure access via HTTP/S; allows you to hot-add or hot-swap a drive for redundancy or more capacity without disturbing stored data; supports disk quotas
Cons: Pricey and comes with only one disk; adding second disk limits usable storage limited to capacity of single disk; convoluted setup wizard

Adapted from PracticallyNetworked.com, part of the EarthWeb.com Network.

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This article was originally published on July 30, 2008
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