iMac Intel 21.5" EMC 2428 (Mid 2011) Optical Drives
iMac Intel 21.5" and 27" (Late 2009-Mid 2011) SATA Optical Drive
Replace a malfunctioning or noisy model GA11N SATA superdrive optical drive.
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.