Just a final note:

I worked with MS Support and was able to resolve my problem.

Thanks for replying. I am new to SQL admin. I have not run CheckDB.

Full error message is:

Backup failed for Server 'Active02'. (Microsoft.Sql|Server.SmoExtended)

Additional information:

System.Data.SqlClient.SqlError: Read on"E:\Class Database\Class.mdf" failed: 23(Data...