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Floppy Drives
A while ago I got a load of 3.5 floppy drives, their made by Mitsubishi in Japan. They don't have a grate deal of components on, so the 2 main things are the stepper motors, but they also have an opto sensor, small momentary switches, 1 green LED, and probably a magnet sensor.
Here's a look at what's inside them
Opto sensor (infra red)
They have 2 of these very small bearings in.
These are the insides of that pancake stepper motor
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