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Volsnap event id 20


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I have been having a problem that occurred just recently after

I cloned my 200Gb system drive to a larger 1TB drive.


At the time it first occured a few weeks ago I was on Retrospect 7.5, but

now I am using 7.6. The error is the same. I sometimes get an error that

Open File Backup can't start. At that time an error is logged:


Event Type: Error

Event Source: VolSnap

Event Category: None

Event ID: 20

Date: 6/10/2008

Time: 11:58:36 AM

User: N/A

Computer: KRELL


The shadow copy of volume G: was aborted because of a failed free space



For more information, see Help and Support Center at



0000: 00 00 00 00 02 00 58 00 ......X.

0008: 00 00 00 00 14 00 06 c0 .......À

0010: 00 00 00 00 9a 00 00 c0 ....?..À

0018: 00 00 00 00 00 00 00 00 ........

0020: 00 00 00 00 00 00 00 00 ........


I am using Windows XP SP3.


This error occurs randomly, and a restart fixes it. It happens at the start of the backup right

after the 'Starting Open File Backup' message appears.


I have plenty of free space on G: (over 750 GB).

G: is one partition on the 1TB drive.


Since I never saw this before the upgrade to 1TB I wonder if

the free space calculation is getting some type of overflow error?


The older disk was partitioned in the same proportion with the same

partition names.


The number of files hasn't changed very much and the errors appeared

right after the new drive was installed.


I have run chkdsk thoroughly - no bad blocks. Disk diagnostics show

nothing. Nothing unusual in the SMART data. The disk is not fragmented.


I use this system heavily and it is quite stable.


Computer is an HP Pavilion with AMD Athlon 64 X2 Dual core 4200+.

2 MB of RAM.

Windows XP SP3 with all recent updates.


I have posted this question on MS forums and some others, but got no helpful response so far.


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Thank you for the response.


I am not using any software that needs VSS - no databases or anything like that.


I do have PerfectDisk 2008 set up to run defragmentation in VSS compatible mode,

and I set it that way mainly because I knew Retrospect uses that. But frankly, I

don't know much about the innards of VSS or how the document sets are linked. I

just changed the setting to be 'Stop if shadow copies exist' just in case.


Since it is a new drive I have been running PerfectDisk on it quite a lot. By

running in VSS compatible mode is PerfectDisk making thousands of shadow copies

of files - one for every defrag?


I don't know if there is some interaction going on here. Maybe I should ask in

the PerfectDisk forum?


Can someone shed a little enlightenment on this?





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In Retrospect 'Manage Scripts' under Edit and in the Backup window under Options select

'more choices'.


There I set 'Stop when open files cannot be backed up'.


Then in PerfectDisk 2008 I set VSS mode to 'Stop if any shadow copies exist'.


Since I'm not using Shadow copies (to my knowledge) this should have no affect.


It does seem to make the problem go away. It was a random event, and I haven't

seen it happen again since I made the change. Nothing else seems to be affected.


If I see anything happen I'll post something later.

Edited by Guest
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