If using in an iMac 21.5 or 27-inch Late 2009 & Mid 2010 Models you will require an external temperature sensor either part number 922-9624 ( 21.5-inch) or 922-9229 (27-inch ) as this generic hard drive does not have the temperature sensor built inside it.
Description
If using in an iMac 21.5 or 27-inch Late 2009 & Mid 2010 Models you will require an external temperature sensor either part number 922-9624 ( 21.5-inch) or 922-9229 (27-inch ) as this generic hard drive does not have the temperature sensor built inside it.