https://wccftech.com/you-can-upgrade-the-21-5-inch-imacs-256gb-ssd-to-a-1tb-fusion-drive-absolutely-free/ > Apple won’t charge you anything if you want a 1TB Fusion Drive instead of the 256GB SSD that comes as standard. > The entire iMac lineup finally, finally ships with SSD as standard. What this means is that you don’t have to deal with measly, slow hard drives with awful boot times and mediocre app launches.