cgsecurity.org

I had to read a bit because I am not familiar with your recovery issue.
It seems that Photorec will find your blue ray ISO files provided that your ISO file contains a ISO9660 file system.
As I only have empty BD-R's and not a single commercial blue ray disc you have to test that for yourself ...

So I messed up the other day and deleted the wrong folder on a USB HD resulting the in loss of several Blu Ray ISO back ups. I haven’t written anything to the disc since. I am currently running photorec only looking for ISO's and was very happy when it found the 1st dvd.iso. However it then must ...