It's Christmas (greetings to all), and so finally I was able to retrieve my 2010 upgrade from under the tree. Following what was helpfully described here, for backup purposes, I did a quick format of my "old" 2009.5 usb drive and copied over the folders and files from my new 2010 usb drive. But while per Properties (Windows XP) the capacity of both drives matches at 160,039,239,680 bytes, they differ in Used space (old is 90,252,083,200 bytes vs. new 90,299,580,416 bytes), and therefore also in Free space (old is 69,787,156,480 bytes vs. new 69,739,659,264 bytes). But on a main subdirectory basis, the 4 main subdirectories match in folder number and size, and the root individual files do as well. Any idea what may causing what appers to be a significant difference at the drive level? Anyone else who has done this notice this discrepancy? What would be on the new drive that would not be on the old after copying? And does any of this have any practical effect? Thanks.

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