Prevent Exchange 2K Event log errors?

We have multiple Exch 2K Servers and I want to disable the IS on the Bridgehead Server. Our Datatabases will on a SAN. I dismounted the Stores on the Bridgehead Server and disabled the IS service but now I’m getting 9175 errors in the Event Log every minute. I went into the Server props/Monitoring Tab and Removed the Information Store from the Default MS Exchange Services hoping that this would not log these errors. Where can I stop these errors from occurring. Thanks.