I have a VR600v, I was using 4x 2TB WD Elements USB Powered Hard Drives via a 4port non powered hub as my Media Server. All was working well.
I had a chance to get some 4TB WD Elements USB Powered Hard Drives for a reasonable price and jumped at it knowing that I'll need more space soon, so I purchaced 4 as upgrades. All are NTFS Formatted.
So I replaced the 4x 2TB with the 4x 4TB, but after plugging in the third, it would start clicking. Ok, I thought, needs more power for the larger drives. So I ordered a 4 port powered USB 3.0 Hub (yes, I know it's only USB 2 on the router, just wanted to make sure the drives where getting the power they need). Everything seemed to be working fine, I could see and access the new 4x 4TB Drives. However after about 10 minutes or so the router would reboot, power back up and maybe 5-10 minutes it would reboot again, looping.
I thought it might be a power issue as everything is running from the one power outlet via a UPS. So I grabbed an extention cord and ran it from another power outlet to solely power the router, so the router should be getting enough power, still rebooting.
I disconnected one of the 4TB drives, still rebooting. So I disconnected another 4TB drive an no more rebooting. Totally confused as to why,
So I can get 4x 2TB's working without the need for a powered USB hub, or I can have 2x 4TB's, but I can't have what I want, and that's 4x 4TB hard drives without the constant reboots. If anyone can shine a light on this it would be welcomed.
P.S. I contacted support via online chat from TP-Link's Webpage before I bought the VR600r with questions about the how many USB drives, size limits, etc, and was told that I could have up to 4 USB Hard Drives and 4TB+ Drives would work (as long as they weren't partitioned).