IDE Extension Cable Cord 6 inch 40-Pin Male to Female for 3.5inch Old HDD DVD-ROM Length: 6-inches ( 15.2 Centimeters ), 40Pin Equals 39PIN and 1x Empty Position Which is Fool-proof design, to avoid anti-plug Compatiblity: for Such as 3.5inch IDE Interface Hard Drives, 5.25inch IDE CD and DVD. NOT For any LCD or Monitors Please Note: Not Compatible with 2.5inch Laptop PATA Hard Drives