"Secure Empty Trash" Didn't Clear Space on HD

How can I reallly clear the space formerly occupied by BackUp files?
When I used "Secure Empty Trash" after putting lots of BackUp files in the Trash, there was no change in the amount of available HD space. I have about 10GB of applications and files on a 60GB HD, so there should be about 45 GB of free space, but there's only 4 GB available.
FWIW, I've Repaired Permissions (only a few were necessary) and Restarted to no avail. I've used "Secure Empty Trash" to remove another file, and it worked just fine!
So how can I clear the part of my HD that I asssume is written with random 0s and 1s left by "Secure Empty Trash", not real files?

John:
Thanks for hanging in there with me! As you knew it would, WhatSize worked.
It identified the old Backup files (that the Finder didn't) and transferred them to the Trash. I used Secure Empty Trash delete them. This time it worked correctly and I have space for Backups again, thank-you very much!
If you have any idea why it didn't work the first time, I'd appreciate knowing it. I've never used it before, so I don't know if it has a repuitation for being buggy or otherwise problematic.
The name "WhatSize" was a little misleading.... I initially thought it would just do what the Finder's View > Show View Options > Calculate all sizes command does. Some of the comments on the Version Tracker site supported that idea, so as the stubborn Dutchman that I am was reluctant to do something that might make matters worse.
I also never considered the possibility that using Secure Empty Trash (as I had) would convert files into hidden files..... especially since I've never had such an experience in uising standard Empty Trash in 25+ years of Apple II and Mac use.
As you expected, I have learned that lots of HD space is devoted to hidden files (that once were visible in the "old days", if I'm not mistaken).
In any case, I very much appreciate your wisdom and willingness to keep replying when I didn't take your suggestion! Thanks!
Cheers!!
Dick

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    Type '''about:support''' in the address bar and press '''Enter.'''
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  • Secure empty trash: How many passes?

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    heey
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    Jasi1311 wrote:
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