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notice that there is a small chip right on the flexible circuit near the bearing for the rw arm. it's partially hidden behind the flexible cable.... I guess this might be a signal processor, moved as close to the heads as possible
I also took apart the fdb motor but didn't get any pics. imagine a cylindrical shaft surrounded by what appears to be a sleeve bearing.. it's a lot like a sleeve bearing but there's a thin layer of oil that prevents metal to metal contact. on the bottom is a small cap, soldered on and sealed with glue. there's a spiral groove on that cap, when the motor is spinning it creates pressure in the oil to keep the moving metal parts from touching. this motor can run continuously for a very long time. (but if there is a problem with the seals or the oil evaporates, then the drive will fail catastrophically )