Traduciendo paso 8
Good-bye optical drive, we hardly knew ye...
The new iMac carries a Sony Optiarc optical drive, model number AD-5690H.
The area shaded in red in the third picture is presumably where the optional SSD is housed. The three mounting points within the shaded area have nothing attached to them in our machine, since this option is only available on 2.7 GHz 21.5" iMacs.