*****Do NOT open the drive!!!!***** I used to design/manufacture drives for Seagate and the head actually flies 1-2
microinches from the surface! A single molecule of smoke can tear the write head off. These are assembled in a clean room environment, and can
never be opened in a non-cleanroom environment - the platters are covered with oil, and will turn into an unrecoverable Chia pet.
Depending on what is on that drive, the cost of recovery may be prohibitive. A drive scan utility similar
to these would be where to begin. If the drive is put into a bootable machine, it will be simpler to evaluate. Mechanically, a HSA (head stack assembly - all the arms) is extremely unlikely to have issues, but a head can stick to media if allowed to come to rest on it (also very unlikely with modern design). The head itself taking damage is possible.
The circuit board on the drive may be another issue, which may be replaceable, but if a head has been damaged, an entirely new set of head is required to read the platters (not the head, nor the arm is replaceable). This must also be done in a cleanroom environment, which is why it is so costly.
Again do NOT open that drive (break the hermetic seal on the edge). Which model of drive is it? Does it make any noises when trying to read?