Unfortunately, it is not possible to add more memory to your MacBook after purchasing it. It is therefore very important that you choose enough storage capacity when purchasing your MacBook. The table above is a guide, but not a guarantee. In addition, MacOS already takes up at least 8 GB of the available space. So if you have smaller hard drives, you'll need to use iCloud or an external hard drive. Do not you want that? Then choose more storage capacity.