Errcode 13 error on delete of table

While attempting to drop a database in MySQL, an error message appears:

MySQL said: Documentation # 6 - Error on delete of './bedrock/groupre开发者_运维技巧c.MYI' (Errcode: 13

I was logged in as root user with all privileges.

What's the cause of this error, and how can this be remedied?

You didn't mention which OS this MySQL instance is running on... Windows, Ubuntu, etc?

Do you have any anti-virus processes on the server?

Potentially a process has this .myi file locked, thereby blocking the drop.