How to recover playlist made directly on the hard drive

Hello everyone, 

After a bit of research I can't find a solution on this forum / the internet. 

I made some playlist "on the fly" directly on my USB Hard Drive, for some reason while uploading an album my hdd rebooted and now it shows that the library is corrupted.

I saw some possible solution but it's for playlist made on the computer directly.

So before trying anything and screw my playlist even more I'd like to know if there is anyway to recover the playlists made on the HDD since it wasn't made on my computer? Or this is dead and will have to remake everything? 

Thanks a lot :)