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    I wonder if the cluster size is larger on the new drive. You might want to get the stats from the same place so we can see file count and usage for the path, not the drive.
    – uSlackr
    Commented Aug 19, 2015 at 0:34
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    While cluster sizes can make a big difference they can't make this difference. He's got about 100,000 entries, a 100gb difference would require a cluster size of a megabyte--something that I don't think is an option. I think it's much more likely there were hidden files that weren't copied. Commented Aug 19, 2015 at 2:13
  • Usually there are hidden system files on this drive that weren't copied. If you have moved your pagefile and hibernation file, or windows System Restore points. Try to enable Show hidden files and folders , and to disable Hide protected operating system files from the folder options. Commented Aug 19, 2015 at 13:48