Thanks everyone. Yes, Ray, I agree with Bodhi about power, I agree it can be a problem, but I have tried a USB2 HD drive in that USB3 port and it works perfectly - so I'm pretty confident that's not the problem this time. I like your proposal re: replacing the controller, Bodhi - but I think I'll call it quits for now! As I say, the drive - fundamentally - works, even if only in a USB2 port, and I hadn't planned on using it with the NSA box on a regular basis (I found the problem when I was using it to extract data from the original NSA325 disk that had an unusual 'raid' partition on it). Like most things electronic where software is involved, we just have to accept that not every scenario works. I'll mark it up as part of life's rich experience......
Thanks, again, for all your advice and help - Mike
Thanks, again, for all your advice and help - Mike