593-1010 922-9137 Cable, Hard Drive Data - 21.5 inch iMac 3.06-3.33GHz Late 2009 A1311 NB-3100W This is a replacement hard drive cable for the 21.5-inch iMac. If you are having issues with your hard drives reading and writing data, you may need this replaced. Apple part number: 922-9137, 593-1010