As per Microsoft: "Exchange reports a -1018 error when an initialized page in the database file is found with either of the following conditions:
- The checksum that is stored on the page does not match the result of the checksum recalculation that is performed as the page is read.
- The page number that is stored on the page does not match the page number that should be on the page, given the page's physical location in the database file.
Exchange might be responsible for self-generating a -1018 error if Exchange does one of the following:
- Constructs a page that has the wrong checksum.
- Constructs a page correctly, but tells the operating system to write the page in the wrong location". See M314917 for more details.
As per Microsoft: "In earlier versions of Exchange, event ID 475 is also used to report the occurrence of a -1018 error. Exchange 2003 SP1 does not use event ID 475. Exchange 2003 SP1 uses event ID 474 to report the occurrence of an unrecoverable -1018 error, and event ID 399 to report the occurrence of a recoverable -1018 error".
If this error appears on a Dell PowerEdge computer when you run Microsoft Exchange Server 5.5 or Microsoft Exchange 2000 Server, see M322729 to fix this problem.
The meaning of this error is that the checksum calculated using the actual content of a Jet database and the checksum recorded in its headers do not match. Typically this indicates the corruption of the Jet database. This can occur due to faulty hardware (hard disks, I/O controllers) or external condidtions like a sudden power loss.
The recommended way to recover from this is to restore the Jet database from a backup. The alternative is to use repair utilities to attempt to fix the mismatch between the two checksums. If the data itself is not corrupted, then the utility might be able to fix it. Jet database is used by Exchange and Exchange comes with utilies like Edbutil.exe that can be used to fix the databases.
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