I have the following error appearing in Event Viewer several times per day:
The shadow copies of volume C: were aborted because of an IO failure on volume C:. source: volsnap
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I'll show you bellow a possible way to fix this kind of error. I'm using Windows 7, but these instructions are valid for Windows 8, too.
As you can see in the Administrative Events, I have a lot of errors, so I'm starting to fix the first one, which is caused by the VolSnap source.
First of all, you must have administrative rights, to get access to the System protection tab of the System Properties window:
Just select your operating system drive letter, and press the Configure button, to open the System Protection window.
Looking at the Disk Space Usage, you'll see there is no space left for Shadow copies to function correctly.
System Restore might use between three and five percent of the space on each disk. Therefore, we need to move the slider to the right and to increase the disk space used by the system protection.
After pressing Apply, OK and then restarting the computer, everything will be just fine.
A funny thing: in my case, all the other errors have disappeared, a sign that all of them were related to the first one.