BS alert on the answer above. The OS does not limit you to 2GB. I am running 8GB on my HP Pavilion Chromebook just fine thank you very much. I upgraded to 120GB SSD with no issues whatever. But I've not seen any affordable SSD's of larger sizes as of yet. You could get a 512GB one easily enough but it would cost ~$500USD. Just get a cheap magnetic external drive instead. Also neither upgrade had any impact on my chromebooks admittedly terrible battery life and it rarely ever turns on the fan either.