Couple of question about TI

Bob, only part of the partition data is visible in your clip, and we can't move the sliders to see the remaining data

However, from what is shown in your two screenshot posts, a few things can be determined. Your partition size in DD is showing correctly based on both screenshots showing Disk 3, sectors 0-977,xxx,xxx at the top of the window. That's consistent with the 465GB or so you're showing in the previous (graphical) DD screenshot. The second screenshot shows only the single partition, also consistent with the first graphical screenshot.

So according to DD, you don't have any problems with that drive, although it shows only about 100GB used, based on the data in the table included in your first screenshot, and the greyed out portion of the partition in that same graphical screenshot. You claimed the drive was almost full when you started your backup/recovery process, so I can't explain what might have happened to the other 300GB or so of data that seems to have vanished.

Does your Windows Disk Management utility still show the drive as bigger than 500GB?