Before you allow your Macbook or Macbook Air to update the operating system ….. make sure you have enough free disk space or you will turn it into a brick
Check your capacity by clicking on the apple symbol in top left of screen
This example shows lots of spare capacity
This example shows a lot less storage available. Click on “Manage” to try and free up some space or move photos, documents or data into iCloud.
The biggest danger of “low-disk-space” happens when installing updates.
The Mac cannot restart and perform the update which results in the “black-screen-of-death” where the cursor is alive but nobody else is home.
Click on About This Mac -> Software Update …now try “Update All” …. if your low on disk space you will get this warning.
Free up some disk space and try again.
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