Firstly, I get this in the Event Viewer under Application. It is ID 823:
The operating system returned error 1117(The request could not be performed because of an I/O device error.) to SQL Server during a read at offset 0x0000003ac80000 in file 'C:\Program Files\Microsoft SQL Server\MSSQL13.MSSQLSERVER\MSSQL\DATA\OperationsManager.mdf_MSSQL_DBCC9'. Additional messages in the SQL Server error log and system event log may provide more detail. This is a severe system-level error condition that threatens database integrity and must be corrected immediately. Complete a full database consistency check (DBCC CHECKDB). This error can be caused by many factors; for more information, see SQL Server Books Online.
This alarmed me so I ran DBCC CHECKDB and I get this:
Msg 8921, Level 16, State 1, Line 1
Check terminated. A failure was detected while...
