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Event ID: 27 Source: VolSnap

The shadow copies of volume <drive> were aborted during detection because a critical control file could not be opened.
EV100580 (Critical Error: Event ID 27; Event Source Volsnap; Windows 7) provides information on the root cause of this event some suggestions on how to troubleshoot it.
This problem occurs when you import a transportable snapshot that is set to read-only. ME924058 (no longer available) indicated that this was a problem affecting Microsoft Windows Server 2003 and it was fixed with Service Pack 1.

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