ISTR that an earlier version of DiscWizard incorporated an Alt+T+O hotkey (Techical Override) that allowed it to work with non-Seagate drives.
BTW, if your drive has bad sectors, then you will need imaging software that can work around bad media.
Some freeware cloning tools are ...
Comparison between ddrescue and dd_rescue: http://www.forensicswiki.org/wiki/Ddrescue
Ddrescue can perform multipass cloning. It clones the easy sectors on the first pass, and attempts the more difficult ones on subsequent passes. It can also clone your drive in reverse, thereby disabling lookahead caching. It keeps a log, allowing it to resume after an interruption.
The following thread discusses various freeware and commercial cloning tools: http://forum.hddguru.com/the-best-disk-cloning-hardware-software-t10396.html