http://nwcom.info/Soft/Test/HDD/HD%20Tach%202.61/hdtach.exe
http://nwcom.info/Soft/Test/HDD/HD%20Tach%202.61/readme%20(699).txt
http://nwcom.info/Soft/Test/HDD/HD%20Tach%202.61/readme%20(700).txt