Here is a lightweight utility for your PS3 HDD raw backup, decryption needs, and other features. Right now it only supports slim PS3s.
It's written from scratch except for some ported code form naehrwert's PoC. If you have any feed back, please put it here.
Dumping raw images from external disks.
Image decryption is done in chunks to save memory.
Extracting file block tool. Allows user to dump specified parts of a file.
I'm not responsible in ANYWAY for what is done with this app.
This tool is only for testing. It's not a one-app-solution to recovering data from PS3 HDD yet.
Decryption for NAND will be added later.
If you want to mount GameOS or do on-the-fly enc/dec, linux offers that in it's "device mapper". (I didn't test it...