What is my free disk space ?

The question seems very dumb, but please be patient:

I have a Macbook with BootCamp installed. On the Mac side, when I clicked on the Mac HD and select "Get Info", it said

Volume Format: Mac OS Extended (Journaled)

Capacity": 159 GB

Avaialble: 102.47 GB

Used: 56.53 GB.

But when I used DiskUtility from Application folder, it reported:

Capacity 159 GB

Available: 29.78 GB

Used: 129.22 GB

The Disk Doctor apps reported similar:

Free Space: 29.8 GB

Used Space: 129.2 GB

Total Capacity: 159 GB

The OmniDiskSweeper tool also show my Mac HD only has 29 GB free

I carefully looked at all my files in the system did a rough sumation, I believed I only used 56 GB as reported in the first method (Get Info).

I've done many backups, then I draged the old ones to the trask, empty trash ... is it possible the deleted files still hidden somewhere ?

Which one (free space) is real ?

Thanks