Macbook Pro 500GB disk lost 131 GB capacity

Hello,
My Internal Hard disk has a capacity of 500,11 GB.
My Macintosh HD suddenly has an capacity of 369 GB.. This used to be more..
Why did I lose so much capacity and how can I get it back?
Thankyou for your help,
Jouri Postma

Start up in Recovery mode, launch Disk Utility, select the startup volume ("Macintosh HD," unless you gave it a different name), and run Repair Disk (not Repair Permissions.) If any problems are found, repeat. Then restart as usual.
If you don't already have a current backup, you must back up your data before you take the above step. You may be able to back up, even if the system isn't fully functional. Ask if you need guidance.

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Macbook Pro 500GB disk lost 131 GB capacity

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