iMac Intel 21.5" EMC 2428 (Mid 2011)
iMac Intel 21.5" and 27" (Late 2009-Mid 2011) SATA Optical Drive
Replace a malfunctioning or noisy model GA11N SATA superdrive in an Intel iMac from late 2009 to mid 2011.
iMac Intel 21.5" EMC 2428 Optical Drive and Bracket
Replace the optical drive and bracket in a Model A1311 Late Mid 2011 21.5" iMac. This assembly includes the optical drive thermal sensor.
In May 2011, Apple upgraded the 21.5" iMac. Externally, the machine features edge-to-edge glass and an aluminum rear bezel. Internally, an LED display, 4 RAM slots (to upgrade to a maximum of 16 GB RAM), more powerful video processing, and featuring quad Core i5 and i7 processors.