Is there a list of compatible USB drives for a ReadyNas Duo?

Too many out there to test.

Many SeaGate drives work.

Depending on the drive you get you may need to set the sleep timer to never.

"Many Seagate drives work"? Really? This 1TB Seagate "Expansion Portable Drive" doesn't. It's pretty generic, nothing special, so how many different Seagate drives will I need to buy and try before I find one that does?

What version of RAIDiator?

Have to tried both front and rear ports?

Also, I see this is a portable hard drive. It's possible the USB ports in the NAS aren't supplying enough power to the drive. Have you tried plugging the USB drive in via a USB Hub which has its own power supply?

Also one post is enough. You don't need to post the same thing in three threads.

If I'm seeing suspect information in three threads why not ask in all three? People who read only one of the other two threads may be led to believe it will work when in this thread there's an example where it won't. Before posting I did a search and found a number of threads where the same question was asked but the poster was left hanging, the question never answered. I need to back this up, so just need good information before I buy another external drive that won't work. And if the problem has a solution I'll be happy to post it in those other threads as well, so anyone else researching the same or similar problem will find an answer.

Yes, I tied it both with a standard USB cable, one of those two-USB on one end cables for older drives that needed more power, and also a powered USB hub, it isn't recognized in any configuration. I can plug in two other (smaller) external laptop drives in generic cases and they're both recognized, so it isn't bad ports. It's an earlier Duo v1, not a v2.

Well you're replying to threads that are dead which means one can assume that the issue described in the thread is resolved one way or another. Also posting in several threads makes it difficult to track what suggestions users have made to resolve an issue. Posting in threads for very different products such as the Duo v2 isn't that helpful either as USB hard disks compatible with the Duo (v1) may/may not be compatible with the Duo v2 and vice versa.

What version of RAIDiator is on your Duo?

Is your SeaGate "Expansion Portable Drive" recognised by a Linux machine (e.g. one running Debian or Ubuntu) if you hook it up to that?

Raidiator 4.1.10 [1.00a043], purportedly the latest available. I don't have a Unix or Linux machine available, sorry. The Seagate drive is a "Seagate Expansion Portable Drive", model number 9SD2A6-500, connected, as mentioned, with a variety of different cables, powered and unpowered.

This thread is for the v1 (one of the others was a thread for the v2).

What format is the USB disk using? If you formatted it, what did you use to format it?

NTFS. I don't remember what I originally used to format it, probably Windows XP, but maybe Vista or Seven. I've had it for some time, used for backups, and it's worked with all kinds of desktops and laptops, no issues until now.

EDIT (added June 23): I need to get something working for backup, so yesterday I bought another drive, a Western Digital, the newest USB 3.0, which will be here this week. Since there's no compatibility list I guess I'm just hoping it will work. Tell me, why does the Duo have a problem finding the Seagate? USB is just an interface, right, and isn't it a "standard"? I've never had a problem with any other USB device before, dozens and dozens of them, on any computer or anything else, so what's the difference with Netgear? How could it be different than every other USB device?

The new WD drive works as it should.

Still no explanation why the Seagate doesn't? It would be nice to answer that question so this thread isn't left dangling, and the next poor soul with a Seagate drive who has read that it will work... but doesn't, can find an answer. As you said "Well you're replying to threads that are dead which means one can assume that the issue described in the thread is resolved one way or another." I think that's a pretty charitable assumption, and since this Seagate drive doesn't work we don't want to let this thread die and imply that a resolution was found, so any suggestions? The Seagate drive has worked every other place I've tried it, never a hiccup, so I know it's good. The Duo works with the WD drive, so I know the Duo is good. But the Seagate "Expansion Portable" drive won't work with the Duo. Newest Radiator, different cables, I've tried all the suggestions offered and know it's getting full power, so any other ideas?