I have 4 x 1.5TB Seagate drives in my NV+. The NV+ recently refused to reboot - all 4 disks could be heard to spin up, but the boot process hung. I finally diagnosed the issue to a problematic Disk #3 - pulling the disk and the NV+ booted just fine, though no longer redundant.
The disk is less than 6 months old and running vendor tests on the disk revealed no errors or problems.
I deleted all of the partitions on the disk and re-inserted into the NV+. A resync then completed fine and the now redundant array has been running for a week without issue; no SMART or other errors are being reported.
Question: What confidence should I now have in this re-inserted drive? All tests and recent usage suggests the drive is fine, but it clearly was the cause of my NV+ boot issue. Can anyone explain what could be the root cause for these symptoms? If I can understand what could cause the boot failure, but a forced resync then cure the issue, I may be able to figure if I need to replace the drive or not.
NAS: Ultra-4, NV+ & Duo v2 :: ST31500341AS & HDS723020BLA642 Drives
Network: Netgear GS108Tv2 / DM111P :: Airport Extreme / Express & Time Capsule
Clients: OS X 10.6 - 10.8 :: Ubuntu 11.x :: Win 7 + SP#1
UPS: APC ES-550