Sorry, my posting does not seem to be too clear.

I meant 3 different tries with WD & 2 different with Seagate.

The first try with that Linux tool made the WD totally unformatted / unpartitioned.

Incidentally, as a last ditch effort, I put the WD disks back in before going to bed, it started blinking 4&5. This morning nothing was blinking. But the MD600 did not show up anywhere.

Re-boot MD600, now they are back blinking.

Main : C15, MD600, Aurender N10, EMM DAC2X, Boulder 865, Oppo BDP-95, JM Labs Maestro Utopia
Office : PC, Resonessence Invicta, HD800