I took Scott's course, & I'm not gonna jump into... you have to buy it. if you can save your money & get a Deepspar disk imager .. simple to use & highly effective. & like poehere said, get some broken drives & figure out whats wrong with them to fix them... you will be surprise on how much you can do, once you get a failing drive into good running order drive.... problematic motors, bad sectors ,,, even some head diagnostics. trust me get a deepspar... & it almost will run it self. i highly recommend it for simplicity sake. i make extra simple money just cloning drives for other techs. & let them do the logical. the primary goal of pysical data recovery ,is get the bad drive running enough to get the sectors off, & a good Imager will do that..... i usually ask does the Bios recognize the drive, yes.. then i know its just a matter of cloning the drive or cleaning the board with contact cleaner....(usually)
oh yeah the tools that come with the course are pretty cool also, but once yo get deep into this, the next phase i recoment a write blocker, or some linux r/o distros. don't wan to screw aup yuor slvaged copy of a failed drive.