I have SSD on my computer.

I am told by the hd that 120GB are used. I addad up all my files and come to 50GB. On the disc analisis, I have a long yellow bar refering to 50 GB, but I can not locate it. Does anyone know why there is a ghost file of 50GB?

My apologies, I did not give you enough information.  When you open Finder, and when you click on any folder and it is highlited in blue, then you do the COMMAND 'J'. 
Hight light in BLUE example.
Then you would click on the blue hilited folder COMMAND 'J' and you get this pane:
You would the check the box 'Calculate all Sizes'.  Depending upon the size of the file it may take a couple of minutes for the calculation to be made.
Ciao.

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