Having an interesting yet frustrating issue. I have a TS3400, set up with 4 2TB drives in a RAID 10. Got a notification today that one of the drives (Drive 4) failed. Checking the drives in the web console, the capacity of all drives was 1831.4GB, and drive 4 was certainly failed. However my RAID 10 status was normal. I tried replacing the bad drive, but after dismounting it, my RAID status went to degraded. Popped in a new drive (same WD drive as what's in there) and it formatted to 1830.3. It wouldn't let me add the drive to the array, assuming because the formatted drive space was smaller than the other 3 drives. Tried to format the drive in Windows prior to adding it to the TS, and same result. Any ideas what I may have done wrong? Or is the TS3400 just being dumb? I really can't be wiping the entire array when a drive fails. That pretty much defeats the purpose.