Providing the new drive is liked by the DTR-T2000 the easiest way, but not the quickest, is to:
1/ Replace the 500GB drive by the 1TB drive
2/ Switch on and let the HDR-T2000 reformat the new drive
3/ Check that you can record, and play back, using the new drive
4/ Check that you can turn the HDR-T2000 fully off, and when turned on again it still recognises the drive
5/ Using a SATA HDD to USB adapter with its own power source (costs about £15 to £20), connect the old drive to either of the HDR-200T’s USB ports. When in the HDR-2000T media list you can now select the blue button and view, and play, the old recordings on the old drive
6/ Using the HDR-T2000 copy feature, copy the old recordings from the old drive to the HDR-2000T. This will be slow. Also, you may want to copy just one recoding across first, to check that it copies OK.
Alternatively instead of copying them back to the HDR-2000T, the HDR-2000T can play them directly from the attached drive.