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

joez148

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Jun 7, 2015
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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?
 
A little discrepancy is normal but that's a lot of discrepancy.

I am no Windows backup expert but I would ask, where do you keep the backed up files? Were those files included in the original calculation, because backup maybe smart enough to not backup itself.

Did you run a disk cleanup before doing the backup? because Windows backup maybe smart enough to do that for you, at least skip the temp dir, the downloaded files, the cache, updates, certainly hibernate.sys and pagefile.sys.
 

joez148

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Jun 7, 2015
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First time I ever did this. I did no cleanup, nothing is compressed. I just followed the directions. Created full system image through the windows 7 back up utility. Saved it on external hard drive, swapped the internal drives, then installed the image onto the new drive. Everything is exactly the same on the computer, you would never know its a different drive. Except the 400GB of used space difference between the drives. The only reason I bought the new drive is because the old one was almost full. If it was only 322Gb like the new drive is showing I would have never needed the upgrade.
 

joez148

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Jun 7, 2015
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Solved:

This free utility can be used to scan the HD and show what is using the space
http://www.jam-software.com/treesize_free/

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.