Today, I made one of the silliest mistakes I ever made.
While trying to create a Live USB on my Pendrive, I accidentally used dd if=image.iso of=blabla/sdb (my external HDD) instead of sdc (the actual directory of my pendrive), so I lost everything in my external HDD and of course, got replaced by the Manjaro image I was trying to burn into the USB stick.
I tried with TestDisk, but couldn't find anything.
At this point, I'm 90% sure that my data is lost because dd is really good at it, but maybe one of you has a different experience.
Anything I can do to retrieve my files?
Not sure if it would work but you could try ddrescue http://www.gnu.org/software/ddrescue/ddrescue.html
I've only heard about it and never tried it, but might do the job.