Introduction
My Macbook Air keeps saying I'm out of disk space is there something I can buy to get more space so I wont have to delete anything?
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First please confirm that message is legitimate because at least one such message is fraudulent and a solicitation to install malware.
Capture and post a screenshot of the dialog you are encountering.
The example I'm thinking of is illustrated in this Discussion: MacBook Air low on memory? To determine the available storage on your Mac and what to do should it become low, please read How to free up storage space on your Mac.