> Higher speed spindle motors on CD and HD drives are usually three
> phase brushless motors with hall sensors used for feedback to
> create the proper drive waveforms (not so much exact speed control,
> although that follows as well.)  Most of the ones I've seen have
> the three phases connected in either Delta (3 connections) or Wye
> (4 connections

If the CD motor is Delta, maybe this will help

http://home.clear.net.nz/pages/joecolquitt/0hdd.html

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