I think you’ve successfully made an exact copy of what you already had before but what you now need to do is use one of the disc management tools to extend the (1TB) partition into the “unallocated” 1TB of the new drive.

Bearing in mind I’m a complete novice but with a healthy willingness to have a go, it’s a long time since I did this myself and some of these disc management tools do require an understanding of computer gobbledegook… I’m hopefully that somebody clever will be along shortly to recommend a user friendly tool that’ll do this without too much hassle.

Having said that you can’t break it and could just format and start over if you got it badly wrong, you’ve still got the original disk to clone again, I hope!

Best wishes

Richard

Main system; 861v8 ID41, DSP8000SEU fronts with DSP5500 centre and DSP7000 rears (all in lovely silver) 504, HD621
Second system 861v4 ID40 LPS, G98DH, 504, HD621, 2x DSP5200 with DSP5200 centre
MD600 tucked away in study. Lots of other Meridian!