593-1008 922-9130 Optical Drive Data Cable - Late 2009 A1311 3.06-3.33GHz, 21.5 inch iMac NB-3106W This is a replacement optical drive cable for the 21.5-inch iMac. If you are having trouble reading and writing to your optical drive, you may need this replaced. Apple part number:922-9130, 593-1008