So you mount an external disk, try to go to the directory where you need to go and Windows tells you that you don't have the permission to do that.
I never understood the philosophy of Windows security, probably because I'm used to Linux. I don't want to understand it anyway unless it gets in my way.
What I tried successfully is:
- Open the folder's Properties.
- Go to Security and click Advanced.
- Change Owner: Enter the object name to select and do Check Names.
- Check Replace owner on subcontainer and objects.
- Ignore the Windows security warning.
- You're done!