Sorry for the late responses...not a heavy amount of activity in this forum and I'm a recent member. For the sake of those who might stumble on this thread whilst googling for answers:
Disk manager shows raw format and healthy but it can read any exist file on it
I'm assuming you mean can't
read files. The following is an old trick for drives with mechanical issues, but will often work:
Before anything else, download a copy of Linux Ubuntu
and burn the ISO to CD for later possible use. Remove the drive
from the case, wrap it in a towel, place it in a ziplock. Now place it in the freezer
for at least 2 hours. Remove
from the freezer and try to recover your files. If you can't read
them with windows, insert the Ubuntu CD, choose "Live"
(rather than install to HD). Mount the problem drive. Can you see your files? If not, then expensive Data Recovery will be your only option, but most don't need this option unless the data is important enough to spend that kind of money to recover.