It is not uncommon for these drives to get stuck heads, though the issue may be more of a logical one. If the data is important, you really should seek professional data recovery assistance. It likely won't cost more than a few hundred USD.
A few labs I recommend are:Recovery ForceData-MedicsPCImage
On the off chance that the issue is with formatting, you can try R-studio
. But, I read your description that the drive not being physically seen, suggesting physical issues.