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#11
Damage is actually minimal- and the damaged block may not even be in use.
What does HD Tune's Health tab say?
HDD's automatically reallocate damaged blocks from a pool of spares.
That said, if you have no backup, that's essential. Note that disk imaging will only succeed if all the used area can be read (no CRC errors).
If that's your system disk, believe it is failing, and you want the best chance of recovery stop writing to it. I.e. don't use it as a system disk.
You can boot your PC from a live boot disk, or for disk imaging purposes for example, the boot disk you can create using Macrium Reflect (free/paid). That way you will only be reading that disk.
Naturally you would prepare any boot medium on another PC as you would stop using this one.
tenforums members recommend the routine and regular use of disk imaging so you can deal with such emergencies in a relatively stress-free manner.