Boot drive access locked

My boot drive has become locked (now a folder with a red minus mark instead of a drive icon). In get info it says "you have no access" System and admin are listed as having no access. Can't change these. Is there a terminal command I can use to fix this?

Run the following from the Terminal:
sudo chmod 1775 /
Provide your administrator password when prompted; nothing will appear in the Terminal window.
(27008)

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