the shadow copies of volume c were aborted because an io failure on Results

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I've been having tremendous difficulty backing up my drives.

I keep getting the following atapi and volsnap source errors in event view -

atapi - The driver detected a controller error on DeviceIdeIdePort0.

volsnap - The shadow copies of volume C: were aborted because of an IO failure on volume C:.

Is anyone experiencing this? I've tried just about everything - using different ports, reformatting my destination drive, checking for drive errors.

How can I avoid this everytime I do a back up? It seems to be a recurring problem - please help.