I copied a folder containing 1000's of sub folders and files from one drive over to another drive but the resultant folder wasn't the same as the source folder, in fact, it was larger.

Folder On Source Drive:

Size: 15,082,689,933
Size On Disk: 15,034,846,155
Folders: 71,521
Files: 5,465


Folder On Target Drive:

Size: 15,084,460,103
Size On Disk: 15,240,458,240
Folders: 71,548
Files: 5,465

Note how everything on the target drive is larger except that the number of files is the same.

How can this be?