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Recovering data from a failing hard disk with HFS+

Recently, a customer asked me te have a look at an external hard disk he was using with his Macbook. It would show up a file listing just fine, but when trying to open actual files, it would start failing. Of course there was no backup, but the files were very precious...

This started out as a small question, but ended up in an adventure that spanned a few days and took me deep into the ddrescue recovery tool, through the HFS+ filesystem and past USB power port control. I learned a lot, discovered some interesting things and produced a pile of scripts that might be helpful to others. Since the journey seems interesting as well as the end result, I will describe the steps I took here, "ter leering ende vermaeck".

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Copyright by Matthijs Kooijman