Sometime you may have experienced error while copying data or taking back-up of your hard disk.

There are few common reasons you may look at to resolve the issue
1. Your data may have been corrupted
2. Your target drive may be corrupted
3. Your source drive may have some bad sectors

Solution:
1. Check the integrity of data. Check if it is ok and working
2. Perform disk check command in the source drive. Command chkdsk /r drive: