I found this post on another forum.
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It isn't missing, it is just not displayed by default.
To show drive free space in the Computer folder, press Alt+V to open the view menu. Click on the "Chose Details..." item. You will see that "Free Space" is one of the available items.
"Percent Full" shows a nice graphical representation as a bar.
These details will be shown both in the details view and tiles, but they won't be shown for removable media drives.
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and...
..select either tiles or content. Now your drive space indicator is restored.
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Also on my computer I could select multiple items and get total file size in a bar that appeared just above the status bar. I hope this helps. If not post back, I'm pretty sure the...