empty disk drive has used space

hello,i have recently noticed that a disk partition which i have never put anything on has some used space

this appears when i click "Properties":

but when i open the disk drive it shows nothing at all

a scan with spybot shows this:

i am using windows 7 ultimate if that matters

via Bleeping Computer Last 20 Posts http://www.bleepingcomputer.com/forums/t/510520/empty-disk-drive-has-used-space/