western digital 750 not showing any partition or data
www.freewebs.com/bgotchall/index.htm (see that!) ;-)
Ddrescue, dd_rescue, and HDClone are freeware cloning utilities that know how to work around bad sectors. They can also clone your drive in reverse, effectively disabling lookahead caching.
Comparison between ddrescue and dd_rescue:
The Best Disk Cloning Hardware/Software: