This is my 1st post, but I think I can provide a lead.
*DON'T DISASSEMBLE/OPEN UP THE HD by yourself under any circumstance.
*Try to make sure it is not a software/Windows problem by installing it as a secondary drive to a computer. If you have access to a drive enclosure, you can essentially make it into an external hd and connect it to any computer by USB. Many times the problem is in the boot sector or some other software reasons, and the hd is physically fine. SW can be easily and cheaply dealt with (there are many data recovery software out there that works pretty well for recovery data from any sw drive problem). Once you recovered the data, then just reformat the drive, then you be set.
*If the problem is hardware related, i.e. the mechanical working of the hd is bad, then get professional help. Once you suspect that the problem is hardware, stop trying use the hd, this will make the problem worse as you may further damage the media. Ask yourself if the data is worth $500+ to you. Remember your cost include shipping and handling, not just the data recov service.
I personally recommend this place http://www.gillware.com/
I have a HD physically gone bad before, having the classic terminal syndroms such as clicking and scratching noise. I cannot even get it to work as a 2nd drive, nor can I use any data recovery sfotware no matter what I do. Send the hd to this company and they did a masterful job.
1) If the hd cannot be used anymore, they will put in on a disc for you.
2) The price is pretty reasonable compare to the other data recovery services. Do research and you will sure to see that their price is pretty good.
3) I can personally testify to their quality of work and service. Their turnaround time is excellent.
No matter which company you choose, keep a couple of things in mind.
1) make sure they have a clean room (no dirt, no static) with professional equipment
2) get an quote estimate first with a max ceiling.
let me know how this works out for you.