I already did recovered a few files that I needed ASAP (work-related) and at that time I could see/access everything else, but it was read-only so I needed another 3tb HDD, which I don't have.

I don't know if anything changed in the last few years but as far as I know reformatting doesn't really erase anything: http://en.wikipedia.org/wiki/Disk_formatting#Reformatting