You could try to analyse the hdd in linux, messing with the reiserfs drivers since it seems it's based of (but it's slightly different, read the differents analysis dev topics).
You give me an idea, i ll try to take a look with easy recovery too with manual settings ;p lol
Ps : the problem will be the same, everything is encrypted, but hey, who knows without trying what can be found, and what we will have one day, maybe
PS3 Hard Drive
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Linear Mode