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If you get a lot of stripped screws, you may want to add a manual impact driver to your toolkit. It's a sleeve around a ratcheting shaft. You hit the end with a hammer and the shaft rotates a 1/4 turn. The hammer blow forces the bit into the screw and rotates the shaft at the same time. Per previous poster: use Robertsons instead of Phillips or Torx.
Hard drives have 1 or 2 Neodymium magnets in them. You will have to peel them off the armature.