Devil'sAdvocate wroteI guess you have to prioritize here,unfortunately.
would you rather have a headache and keeping your data (that is assuming,this is fixable)
or format the drive and have it functioning again.
if none work,it must be that it took a really nasty fall.
After you do a format and take care not to place any data on the drive after that, then you would be able to recover every single healthy non damaged file that was present on that drive before format.
@metalloy: what exactly were you able to see in disk management? Was there a partition of any type? Unallocated space? if you are unable to describe, may you please provide us with a screenshot? (an efficient one, no bonuses, a rectangular snip using snipping tool would be efficient)
Edit: Ahh sorry, was on phone, didn't see page 2.
Edit 2:word of advice, metalloy, DO NOT send it to a repair shop.this drive, if working, could easily be formatted and made to work properly. If the guy there decides to run a test by copying a file to the disk , you could kiss some of your data goodbye. As devilsadvocate said, download ZAR, and try it. If zar needed it, then perform a format. This is done in disk management. Right click on RAW partition, then click on format (quick if you want, if ZAR would slow down too frequently when attempting scan for lost files, then do a full format and try again.) Format will not delete anything. Neither quick format nor full format delete anything. The only thing that deletes data is an unerase software that OVERWRITES the existing data on the drive with garbage data, which is not what format would do.