Upload & Sell: Off
I cannot use a Drogbo, but we normally run with the Constellation drives in the NAS. They recently qualified a 4TB drive.
Those 4TB drives are just coming out, and are of the latest generation: Constellation ES.3 with 1TB per platter. I just received the 1TB version today. Tested the SAS hot-plug feature - it worked. Linux placed it online without even rebooting! Tests indicate good serial read performance of 170 MB/s in the outer zone. These drives are cooler than Cheetah 15K, but do need airflow.