Hard Disk Memory Lost (nowhere to find)

Hi,
I looked for this problem in the internet but I couldn't find anything yet.
I have a very bad problem with my harddisk. The problem is, that there is more than 50 GB out of 250 GB filled with something I can't find. I've downloaded the program SupaView and searched the harddisk. But it stucked while searching my harddisk (see picture). All directories together on my local harddisk fill about 170 GB, but the capacity of my APPLE SSD SM256E is 250 GB !
Please, has anyone any idea why there is this difference?
Thanks for help
Moscity

Moscity wrote:
The problem is, that there is more than 50 GB out of 250 GB filled with something I can't find.
Why do you think so?
I've downloaded the program SupaView and searched the harddisk. But it stucked while searching my harddisk (see picture). All directories together on my local harddisk fill about 170 GB, but the capacity of my APPLE SSD SM256E is 250 GB !
If it didn't finish, the display is incomplete, so you really don't know what's there.
I don't use that particular app (there are a number of similar ones).   But it shows 55 GB of "unscanned space" and 12 GB of Empty space. What you're after is probably some or all of that 55 GB.
First, you might have a directory problem.  Try Verifying your HD, per #6 in Using Disk Utility.
If that doesn't find anything, if you use Time Machine, take a look at The Storage Display.  What does it show in the Backups section?

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