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Error in the log - what does it mean?

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I recently have taken to running a "verify" on all my backup sets on a schedule, so I get some notification when the HW starts having trouble reading the media.


On the most recent rotation, I see this:


- 5/11/14 2:58:58 PM: Verifying v9_iCompute_last
!Generated MD5 digest for file "Quantum18G/Household/Parties/dot75party.sitx" does not match stored MD5 digest.
Remaining: 1 files, 0 B
Completed: 508006 files, 57.8 GB
Performance: 5,651.9 MB/minute
Duration: 00:11:05 (00:00:36 idle/loading/preparing)


What does it mean?


When I restore from this set, I see this:



+ Restore using aRestoreTest at 5/13/14 (Activity Thread 1)
To volume z-junk...
- 5/13/14 3:54:08 PM: Restoring from v9_iCompute_last, Snapshot Joy, 4/28/14 4:22:15 AM
!An error occurred during the verification step. The MD5 digest for the file "Quantum18G/Household/Parties/dot75party.sitx" did not match, error -1129 ( MD5 digest mismatch)
5/13/14 3:58:21 PM: 1 execution errors
Completed: 31118 files, 9.2 GB
Performance: 2,370.9 MB/minute
Duration: 00:04:13 (00:00:13 idle/loading/preparing)


There is a clearly an error of some type. I can't re-do the backup, since this was copied over from another set, and the original backup source has changed.


Is there a way to "fix" this?It looks like I have one file that somehow has a bad/missing checksum. Is this because the copy operation from the other backup set dropped a bit? Is it a Retro bug?


Inquiring minds want to know.

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