I just ordered 8 HGST He8 Ultrastar 8TB HUH728080AL5200 (I listed it in the great deals section if you want some) and I plan to reformat these to match the 4200 series drives I have. Sg_format has a lot of options but so far I haven't seen any of them used for a straight block size change. Have I missed something or is it really as easy as "sg_format --format --size=4096 /dev/da10" for example.