When I run any DBCC command, as I said, I got this error:

------------------------------------------SQL ERROR1------------------------------------

Msg 824, Level 24, State 2, Line 1

SQL Server detected a logical consistency-based I/O error: incorrect pageid (expected 1:3280; actual 0:0). It occurred during a read of page (1:3280) in database ID 251 at offset 0x000000019a0000 in file 'D:\MSSQL\Data\dbfile.mdf'. Additional messages in the SQL Server error log or system event log may provide more detail. This is a severe 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.

Also, its true, that this instnace has more then 800 DBs of average a 1 GB of size. Its a big box.

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