() Corruption was detected during hard recovery in logfile . The failing checksum record is located at position . Data not matching the log-file fill pattern first appeared in sector . This logfile has been damaged and is unusable.

Details
Product: Exchange
Event ID: 464
Source: ESE
Version: 6.5.6940.0
Component: Microsoft Exchange Extensible Storage Engine
Message: <process name> (<process id>) <storage group name>Corruption was detected during hard recovery in logfile <file name>. The failing checksum record is located at position <value>. Data not matching the log-file fill pattern first appeared in sector <value>. This logfile has been damaged and is unusable.
   
Explanation

Corruption was detected during hard recovery in the log file. This log file is damaged and is unusable.

   
User Action

Restore the log file from a backup copy.

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