Norton Ghost Error EC8F17B7

I am trying to backup my laptop so I can replace the hard drive, only I keep getting the following error message:

Error EC8F17B7: Cannot create recovery points for job: My Computer Backup.
    Error E7C3000F: Device \\?\SymantecSnapshot0 cannot read 12288 sectors starting at LBA 424630512.
        Error EBAB03F1: The request could not be performed because of an I/O device error.
Error E7C3000F: Device %1 cannot read %3 sectors starting at LBA %2.
Any ideas?