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Message: <blockquote data-quote="chscag" data-source="post: 829721" data-attributes="member: 46727">It appears your internal hard drive has errors.  CCC is trying to read the data to copy it to the external drive but it results in an I/O error.Did you try booting the machine with your original install media and run Disk Utility to do a verify and repair?  You can not repair errors on the hard drive if it's mounted - you must boot from the OS X install media.In any event, make sure you have a good CCC bootable copy of your hard drive on the external.  In case the internal hard drive is defective you can always boot the machine with the copy made by CCC.Regards.</blockquote>