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?

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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.