Windows 10: You Don't Have Permission to Access

You mount an external drive while sitting at your home desk and now you don't have access to some directories anymore.
What I did to solve this is:

• Select the drive and open the Properties -> Security tab.
• Go to Advanced.
• Change ownership to "Everyone"
• Absolutely remember to check: "Replace all child object permissions entries with inheritable permission entries from this object."

That's it.