New hard drive using less space after image restore then old drive?

My old Seagate 1TB hard drive was filled to 780GB out of the 1TB. Since I was getting close to filled I upgraded to a WD Black 2TB. I used the Windows 7 back up to create a complete system image. I replaced the hard drive with the WD then did a system restore from the image. Everything works fine and everything looks exactly the same except the new hard drive is only showing 322GB used out of the 2TB. I now have both hard drives in the computer and opened up the contents side by side, they both contain the same files and folders. The 1TB drive is showing 780GB used and the 2TB drive is only showing 322GB used. Am I missing something here? Shouldn't they both have the same amount of space used?

I think it only copy your operating system drive to your new disk?
You can check your disks in Disk Management. And also you can create new volumes there.
Right click on Computer - Manage. You will see Disk Management.

Solved:

This free utility can be used to scan the HD and show what is using the space
TreeSize Free - Quickly Scan Directory Sizes and Find Space Hogs

458GB of system volume information on the old drive that didn't copy over to the new drive. So I guess the image doesn't copy the restore points over. I also ran a seagate utility scan on the old drive and it failed at 75%. So it looks like there's bad sectors on the old drive too.

458GB for restore points a lot of space.
What Anti-Virus do you use ?
There is a problem with Avast where it can set the System Restore max disk usage to 50%.

I use Bitdefender now but I was using Avast for years.

I would check the setting on the new HD to make sure it's not set to 50%.
System Protection - Change Disk Space Usage

IDK, its set at 1% (10GB). But this is the new drive. Maybe the old drive was set different. The old drive is showing bad sectors so it wasn't a lost cause. The new drive is also noticeably faster.

A program called Speccy can show your hard drives health,how many days its been on,how many switch ons,errors,etc...