593-0998 922-9216 Cable, Seagate Hard Drive Temp Sensor, - A1311 3.06-3.33GHz, 21.5 inch iMac Late 2009-2010 NB-3096W This is a replacement hard drive temperature sensor for the 21.5-inch iMac. These are specific to the brand hard drive you are using. If you are replacing your hard drive, you may need to replace this as well if you are changing brands. Apple part number: 922-9216, 593-0998