Hard Drive troubleshooting procedure?

Its a complete procedure for hard drive troubleshooting will 4 part guide.Cliock the link below:---

Click this link for section 1:--

http://schematicsdiagram.blogspot.com/2011/06/hard-drive-troubleshooting_24.html

------------

Click this link for section 2:--

http://schematicsdiagram.blogspot.com/2011/06/hard-drive-troubleshooting.html

--------------

Click this link for section 3:--

http://schematicsdiagram.blogspot.com/2011/07/hard-drive-troubleshooting.html

-------------

Click this link for section 4:---

http://schematicsdiagram.blogspot.com/2011/07/hard-drive-troubleshooting_01.html

----------

Go through section 1 to 4 one by one for complete troubleshooting.