The OS considers it to be free space, and eventually it will get reused by something, but for the moment the information is still there but hidden. This has fantastic performance characteristics - it's really fast to do it like this - but the tradeoff is that the contents of the file are still on the hard drive, even if you can't get to the anymore. When you "delete" a file from your hard drive, it doesn't actually erase it it just unlinks it - the handle to the file is removed, and the places on the hard drive that the file had occupied is now marked as reusable by other things. It's quite normal that securely deleting a large number of files takes a long time. I think you may be misunderstanding what "empty securely" means.
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