The motor is electrical, however to get those kinds of speed a LOT of mechanical design is needed to achieve that level of performance. Bearings capable of spinning at 10,000 rpm for extended periods of time is no small feat. Also hard drive design entails a good bit of aerodynamic design as well in relation to the drive head. The head actually "flies" just above the platter on a cushion of air and this ability is designed into the physical structure of the drive head.
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