A week later and no change:
I started SSD Sentinel every day since last week to get proper logging. Looks like the 8 sectors on this drive and the 1 sector on the drive below it has the bad sectors noted from manufacturing.
BTW - How do I translate the "Total Count of Write Sectors" into something understandable? The drive in the screenshot currently shows 3,006,165,257. Disk 2 in the same array shows 558,279,319. The 256GB Vertex 4 that I've had since September shows 259,787,698.
Not sure why each drive in the 3TB array has different write sector counts. The drives have been used in the same array and have never been used by themselves.