Mongodb crashes after unexpected shutdown?

This is a permissions issue, you are running as mongod (or mongodb etc.) user when you start via service, and you are likely running as root (you confirm this in the comments above) when you are using sudo or invoking as root. You need to fix the permissions for all the files in that folder and not start the service as root, ever.

Try deleting the *. Lock file in "\data\db" folder before starting mongod. Exe in CMD.

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