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Connector pinout: Apple Disk Drive Port Apple Disk Drive Port pin name direction description color 1 GND Ground 2 GND Ground 3 GND Ground 4 3.5DISK 3.5 or 5.25-inch drive select. 5 -12V -12 volt supply. 6 +5V +5 volt supply. 7 +12V +12 volt supply. 8 +12V +12 volt supply. 9 DR2 Drive 2 Select. 10 WRPTOTECT Write protect input. 11 PHASE0 Motor Phase 0 output. 12 PHASE1 Motor Phase 1 output. 13 PHASE2 Motor Phase 2 output. 14 PHASE3 Motor Phase 3 output. 15 WREQ Write request. 16 HDSEL Head Select. 17 DR1 Drive 1 select. 18 RDDATA Read data input. 19 WDATA Write data output.