Some hard disk drives have certain problem, when you try to retrieve data from them, you might use IDE to USB adaptor/SATA to USB adaptor, sometimes you always lucky, but certain hard drives can’t be recognized by windows system.
The key point:
connect the hard drive directly to the motherboard through IDE/SATA connection.
Data Recovery: IDE to USB adaptor, SATA to USB adaptor
May 14, 2010