However the 21 inch models put the RAM internally. RAM is easily upgradeable in the 27 inch iMacs to date, with a trap door on the back of the machine. The Fusion drive set can be broken to use the SSD and hard drive separately.
IMac machines continued to use spinning hard drives, but added a SSD slot on some models for a “Fusion” drive, which is a combination of hard drive and a small SSD for caching reads and writes for higher speed. Confusingly, Apple has used at least 6 different proprietary SSD designs in the past 8 years, so matching part to machine year and model is especially important. So industry standard parts like M.2 SSDs cannot be used in many Apple models Late 2012 and newer only Apple parts or specialty replacement parts engineered to conform to Apple’s specifications can be used. What does “proprietary” mean? Proprietary means a physical or electronic design which doesn’t conform to industry standards.
Many of these models can have the internal SSD upgraded, but the SSD has to be carefully matched to the model and year of Mac. At the same time, Apple discontinued 2.5 inch SATA hard drives in these models and changed to proprietary Apple SSD designs. MacBook Pro and MacBook Air models (including all the “Retina” screen models) lost the ability to have the memory upgraded (you are stuck with the RAM that the motherboard was made with). Starting with the Late 2012 models, Apple changed the format of drives and memory in most Macs.
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