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An HDD is used for the motor of the spin coater. Using a screwdriver, the cover of the HDD is opened. As shown in Figure S5, the main parts of each HDD (in this case a Maxtor brand) are a BLDC motor, plotter (disk with recording medium), an in-hub motor, a voice coil motor, an actuator arm, an actuator arm driver, and a read/write head.1 The in-hub motor holds the plotter and is fastened by ... ................
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