External Disk Size Mismatch in Finder

Hi,
I have a 1TB external disk attached via firewire 800 on my MBP. When I do a cmd-I on this, Finder and Disk Utility displays 700GB+ used. But when I select all the folders/files in the root of that disk and do a cmd-I, it barely reaches 500GB... where/what is that extra 200GB?
Side Note: Last thing I did before I got this 200GB extra was I tried to 'Erase Free Space' via the Disk Utility (zero-out data option) overnight. 'Tried' meaning i think it did not complete 'coz when I woke up, there was an error that i didn't bother to take note of and the disk was ejected (not just unmounted). I thought that the cable just got loose so I didn't really gave it a thought... now I think this must be the reason...
thanks,
zurc

zurc,
What you found is an artifact of the "Erase Free Space" routine. You can safely empty the trash to get rid of it, and you should see your free space return.
If you were really serious about zeroing out data on this drive, you might want to try it again. Make sure the Mac to which it is connected is set to not sleep, and to not allow drives to spin down when possible. Keep in mind that a 1 TB drive is going to take a very long time to "zero."
Scott

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Volume name = < >
ascii name = <DGC-RAID10-0223 cyl 49150 alt 2 hd 32 sec 12>
pcyl = 49152
ncyl = 49150
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nhead = 32
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