MacBook Air Storage Space

Trying to clear up some storage space on my old MacBook Air (only 15 GB free). I've cleared out pictures, music, messages, email, etc. But, there is still 53 GB of memory being used for "not mounted". I'm pretty sure it's not the system files (39 GB?). Any ideas on how to free up this storage space (if possible)?



[Edited by Moderator]

MacBook Air (M3, 2024)

Posted on Sep 28, 2026 2:03 PM

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1 reply

Sep 28, 2026 3:37 PM in response to PJTmedia

Re: MacBook Air Storage Space : " ... there is still 53 GB of memory being used for "not mounted". I'm pretty sure it's not the system files (39 GB?) ..."


Seems the "not mounted" memory may have something to do with an external storage drive, perhaps used for "Time Machine" back-ups ... or with a server? I could be wrong.

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Re: "Any ideas on how to free up this storage space (if possible)?"


May need to determine the "cause" in order to reveal or create the solution.

MacBook Air Storage Space

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