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Verification (MD5) errors on disk backup that look to be real


laroire

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I had been using Express (6.0) for a couple years to back up my PC to a Maxtor USB external drive, and recently upgraded to Professional 7.5. Starting with my first backup on 7.5, I have gotten verification errors reported way too often -- on almost every large file that's backed up, and (more rarely) on small ones. I have seen a couple other posts about similar problems where the errors were "cosmetic", but in this case it looks like they are for real.

 

I am using Retrospect version 7.5.324, Driver Update and Hot Fix, version 7.5.6.105. System is up-to-date XP Home. I have two clients, one Mac and one Linux, but this problem was seen before the clients were added, and happens for files both on the local system and client systems.

 

Errors on my backup's varification step typically look like:

Code:


        9/12/2006 12:39:28 AM: Comparing Local Disk (C:)

File "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\1.0\MiniDV tape 1 17.avi": didn't compare

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\1.0\MiniDV tape 1 17.avi" did not match, error -1129 (MD5 digest mismatch)

...

9/12/2006 12:51:09 AM: 51 execution errors

Completed: 6595 files, 12.6 GB

Performance: 1014.5 MB/minute (939.0 copy, 1103.2 compare)

Duration: 00:29:15 (00:03:56 idle/loading/preparing)


 

i.e. as you see, this one had 51 errors like this in 6600 files totalling 12.6GB. And every backup gives more or less the same result, usually on the same or similar group of files.

 

I tried doing a standalone Verify, and get confirmation of the errors, e.g.:

Code:


       Executing Verify at 9/11/2006 11:13 PM

To Backup Set Backup Set A...

Generated MD5 digest for file "C:\Documents and Settings\User\My Documents\Adobe\Premiere

Elements\1.0\MiniDV tape 1 03.avi" does not match stored MD5 digest.

...


(this was from a different backup so the files were different...)

 

Lastly, I tried actually restoring one of these files. It restored fine, but a file-compare utility confirmed that it was in fact different from the original. So it really looks to me like the files are getting corrupted somehow.

 

I don't know if this was happening with Retrospect 6.0 before my upgrade because I had long ago turned off Verification, since it took so long and never reported anything wrong up to that point -- and after all, I was backing up to disk. Since I removed 6.0 prior to installing 7.5, as instructed, I can't easily re-test verification with it. But a test of copying a big file to the drive and then back, seems to come out clean. And no, these files weren't open or changed around the time of the backup.

 

One other anecdote: I needed to restore a small file last night, and that came out perfectly. So overall things seem to be working right.

 

Any suggestions what to try next to identify the cause of this problem? Does it look like a drive or communication error? Or something wrong with Retrospect?

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The backups have been using Thorough Verification. I attach below a complete output from one of those. I am not using encryption. I don't have another internal drive but the same types of errors have occurred when the source was a Mac OS X client on the LAN -- I will include that log also in case it helps. I could copy some files to the USB drive (the backup target) and backup those, I guess. I'll post the outcome of that when I get to it.

 

As an aside, I can't tell if any of the verification errors were from the "thorough" compare or not -- most mention MD5 not comparing and some just say "didn't compare" but those don't specify an offset and also tend to come along with an MD5 error on the same file. So I'm not sure how to interpret them. I also see that some files show more than one MD5 error. Is that because it's verifying the MD5 on previous instances of the same files in the backup set?

 

Here is the full log from a local backup that used Thorough Verification:

 

Code:


+	Executing Immediate Backup at 9/12/2006 12:21 AM

To Backup Set Backup Set A...

 

- 9/12/2006 12:21:53 AM: Copying Local Disk (C:)

9/12/2006 12:39:19 AM: Snapshot stored, 67.8 MB

9/12/2006 12:39:28 AM: Comparing Local Disk (C:)

File "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\1.0\MiniDV tape 1 17.avi": didn't compare

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\1.0\MiniDV tape 1 17.avi" did not match, error -1129 (MD5 digest mismatch)

File "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\1.0\MiniDV tape 1 22.avi": didn't compare

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\1.0\MiniDV tape 1 22.avi" did not match, error -1129 (MD5 digest mismatch)

File "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\1.0\MiniDV tape 1 23.avi": didn't compare

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\1.0\MiniDV tape 1 23.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\1.0\MiniDV tape 1 23.avi" did not match, error -1129 (MD5 digest mismatch)

File "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\1.0\MiniDV tape 1 28.avi": didn't compare

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\1.0\MiniDV tape 1 28.avi" did not match, error -1129 (MD5 digest mismatch)

File "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\1.0\MiniDV tape 1 42.avi": didn't compare

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\1.0\MiniDV tape 1 42.avi" did not match, error -1129 (MD5 digest mismatch)

File "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi": didn't compare

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\Adobe\Premiere Elements\2.0\Jess-Flute-2006-03-09 02.avi" did not match, error -1129 (MD5 digest mismatch)

File "C:\Documents and Settings\User\My Documents\CIARA_DVD_2005\VTS_01_2.VOB": didn't compare

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\CIARA_DVD_2005\VTS_01_2.VOB" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\CIARA_DVD_2005\VTS_01_2.VOB" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\CIARA_DVD_2005\VTS_01_2.VOB" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\CIARA_DVD_2005\VTS_01_2.VOB" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\CIARA_DVD_2005\VTS_01_2.VOB" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\CIARA_DVD_2005\VTS_01_2.VOB" did not match, error -1129 (MD5 digest mismatch)

File "C:\Documents and Settings\User\My Documents\CIARA_DVD_2005\VTS_01_3.VOB": didn't compare

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\CIARA_DVD_2005\VTS_01_3.VOB" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "C:\Documents and Settings\User\My Documents\CIARA_DVD_2005\VTS_01_3.VOB" did not match, error -1129 (MD5 digest mismatch)

File "C:\LZ\Backup Set A\Local Disk\Documents and Settings\User\My Documents\Adobe\Premiere Elements\1.0\MiniDV tape 1 03.avi": didn't compare

An error occurred during the verification step. The MD5 digest for the file "C:\LZ\Backup Set A\Local Disk\Documents and Settings\User\My Documents\Adobe\Premiere Elements\1.0\MiniDV tape 1 03.avi" did not match, error -1129 (MD5 digest mismatch)

File "C:\WinXPCD\CD Drive (D)\I386\OEMBIOS.BI_": didn't compare

An error occurred during the verification step. The MD5 digest for the file "C:\WinXPCD\CD Drive (D)\I386\OEMBIOS.BI_" did not match, error -1129 (MD5 digest mismatch)

9/12/2006 12:51:09 AM: 51 execution errors

Completed: 6595 files, 12.6 GB

Performance: 1014.5 MB/minute (939.0 copy, 1103.2 compare)

Duration: 00:29:15 (00:03:56 idle/loading/preparing)


 

and here is the full log from a Mac OS X backup with Thorough Verification on:

Code:


+	Executing Immediate Backup at 9/10/2006 9:01 PM

To Backup Set Backup Set A...

 

- 9/10/2006 9:01:36 PM: Copying Users on Kids iMac

9/10/2006 9:29:51 PM: Snapshot stored, 2,886 KB

9/10/2006 9:29:54 PM: Comparing Users on Kids iMac

An error occurred during the verification step. The MD5 digest for the file "Macintosh HD:Users:Kids:Movies:Kid Rocks.iMovieProject:Media:Clip 04.mov" did not match, error -1129 (MD5 digest mismatch)

An error occurred during the verification step. The MD5 digest for the file "Macintosh HD:Users:Kids:Movies:Kid Rocks.iMovieProject:Media:Clip 05.mov" did not match, error -1129 (MD5 digest mismatch)

File "Macintosh HD:Users:Kids:Movies:Kid Rocks.iMovieProject:Media:Clip 05.mov": didn't compare

An error occurred during the verification step. The MD5 digest for the file "Macintosh HD:Users:lrl:Library:Fonts:PMingLiU.ttf" did not match, error -1129 (MD5 digest mismatch)

File "Macintosh HD:Users:lrl:Library:Fonts:PMingLiU.ttf": didn't compare

9/10/2006 9:36:07 PM: 5 execution errors

Completed: 7182 files, 4.5 GB

Performance: 269.1 MB/minute (164.8 copy, 734.2 compare)

Duration: 00:34:30 (00:00:40 idle/loading/preparing)

 


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