WD20EARS-00MVWB0 Westerd Digital Cavier Green 2TB

The drive is certainly on the Hardware Compatibility List (HCL) so it should be working ok. You might want to contact Tech Support and open a ticket. If you have owned the NAS for less than 90 days you are still in the free telephone Tech Support period. After that you will have free online support as long as the unit is under warranty.

I saw the 00S8B1 on the HCL but not the 00VWB0 which is why I posted here. I will try Tech support. Thanks.

Mark

Update.
After sending my logs to tech support they couldn't find the problem so they wanted me to take the drive out, reformat it and put it back in. I just received my second drive which is the same as the first one. I hooked it up to my pc, formatted it, ran data lifeguard diagnostics on it and installed it in the Duo. Same error. I went ahead and put the original drive back in and it is now synching with the new one.

I am having this same issue on my v2 Duo with a 1.5 tb seagate. Has your luck changed?

They had me do another factory reset with both drives so I chose flex-raid the second time and it didn't make any difference. They wanted to access it remotely so I rebooted it in tech support mode and haven't heard anything. I could almost live with it if it is something that will get fixed in a firmware update. It's just a pain to copy files over as I have to keep hitting the enter key when it stops. I installed transmissionbt and am happy that I don't have to leave my pc on all night anymore.

Just received an email from Tech Support telling me that I am using incompatible drives and that I should get compatible drives to avoid this issue. I haven't had any other problems so I'm going to keep them for a while. Hopefully hard drive prices will come back down and I will probably get Seagates.

marksb - reading through this again, you are getting a Windows error message. Are you not getting a popup saying that it can't copy the file?

Have you tried a direct connection?

The direct connection eliminates everything in the network except the cable. You should use a known good cable. If you are using the cable that came with the NAS, sometimes the folding of the cable to put it in the box can damage them. Try using a cable that was never folded, but looped. Probably the one between your PC and the router. I started out with a Linksys WRT54G router and they are stable and reliable, but they are also slow and a bit old. If you are using a desktop, you may want to install a gigabit switch and attach the switch to the router and the desktop and NAS to the switch. (It will double the file transfer rate between the NAS and desktop. You are in effect creating a gigabit subnetwork that still has internet access but is not slowed down by the 100Mb/s speed of the router. A trick an IT friend taught me.)

I tried a 100mbs hub with the same result so I tried the direct connection and it worked perfectly! I will probably just get a new router down the road.

THANKS PAPA!!!! :-)

That is one thing that is good about the direct connection, it will eliminate or confirm the NAS is the culprit.

What you are calling a "hub" is probably what the industry calls a "switch". A switch is a wired only device, and is always powered. The smallest is usually a 5 port, and you connect one port to either the router or another switch, and the other ports are then connected to other wired network devices. In my case, one port is connected to the router, and the other ports are connected to two desktops and three ReadyNAS units, leaving two ports open. If you are still direct connected and thus have static IP addresses set on both the Duo and the PC, try again inserting the switch between the two and see what the reaction is. I am just curious if it was the switch or the router.

I wanted to make a correction here, the WD20EARS-00MVWBO are not on the compatibility list. The WD20EARS-00S8B1 sub-model is the only WD20EARS drive that is compatible.