Source:  FILESYS.NLM

Possible Cause:  This is an internal consistency check done by compression to guarantee the integrity of the data being compressed. During file compression, an intermediate file is created that describes the compressed version of the file. The file contains codes describing what should be encoded in the compressed version of the file. The totals from processing the original file do not match the totals from processing the intermediate file. This would only be caused by a memory hit or a disk returning faulty data. The file that was being compressed will remain uncompressed, and the system will try again later to compress it.

Action:  No immediate action is necessary. Note the volume number and watch for more of these same alerts. Also, watch for other errors indicating that the memory or disk is failing. If these alerts or other data corruption problems happen often on a particular volume, the disk or hardware supporting the disk should be repaired or replaced.