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The floppy disk contains an integrated logic board that acts as the drive controller. Like the rest of the floppy disk this is a relatively simple affair, containing the electronics that control the read/write heads, the spindle motor, head actuator and other components. The circuits on this board also talk to the floppy disk controller over the floppy interface. SCSI floppy disks of course include a SCSI interface chip on the logic board to talk over the SCSI interface.
The circuit board can be the source of problems on older drives. In theory, the board can be replaced and the drive repaired, but in practice, again, nobody bothers with repair labor on a drive with a replacement value of under $30.