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...Just realised that this has, possibly, been further complicated by recent install of MSI RamDisk....which came bundled originally with the B360M mobo in my system!

MSI have withdrawn this feature....apparently due to a Windows10 compilation problem.

So...I have removed all traces(supposedly!) with Revo uninstaller, before trying again with IMDisk Toolkit....but still same problem...Drive cannot be formatted!!

Struggling to find a way forward here...