My guess is that it is the sound of the magnetic field generated by an electric motor, that is turned into an electrical signal by an inductive transducer (similar to the pickups on an electric guitar), recorded on magnetic tape, and played back at variable speed.
Some years ago, I put a inductive pickup (that was sold by Radio Shack to record telephone calls via "listening" to the handset speaker) on a hard drive and recorded it spinning up and powering down, and it made some really cool sounds. A variable speed cordless drill also sounded very sci-fi.
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