How do we tell which Hyper-V VM volume is causing this Event ID 27?

How do we tell which Hyper-V VM volume is   \\?\Volume{d58ad371-e9db-11de-a5df-0010185b8e2a  ??
This event 27 is somehow related to our Altaro Hyper-V backup which runs nightly, event 27 occurs every night within 2 minutes of when Altaro starts.

Event 27
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JReamAsked:
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DMTechGrooupCommented:
You should be able to unc path to it.. but here is an article that explains more in detail.

http://virtuallyaware.wordpress.com/2008/07/23/volume-guids-ways-to-viewaccess-the-files-within/
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JReamAuthor Commented:
Follow-up:  
My original Windows Event 27 is no longer happening.  

I think the solution was for me to run this command inside the VM OS:  C:\vssadmin Resize ShadowStorage /For=C: /On=C: /Maxsize=20GB

Previously this maxsize setting was 2GB.   Seems that raising this to 20GB somehow makes the difference.  We haven’t seen the Event 27 again for the last couple of days.
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