You'll need a few tools, google them
scan the disk using HDD Regenerator 2011 http://www.dposoft.net/#b_hddhid
if this fails, then you probably have bad sectors that are damaged, so you'll need to remap them so they are not used
HDD regenerator will stop at a point/sector, make a not of this and then rescan from the next sector, do this until clear, making note of all the bad sectors.
Now we can use MHDD http://hddguru.com/software/2005.10.02-MHDD/
use the program SCAN set the start point to before the failing sector and a few after, switch the flad to remap and run
again do this for all the bad sectors found with HDD Regenerator, you may want to re-run again to double check they have been remapped. Then if you want re-run HDD Regenerator
Hope this helps
Cheers
Rescue PC