macOS No space left on device when there is
How to fix 'No space left on device' when there is 150GB free space on internal drive
iMac Line (2012 and Later)
User profile for user:
hc1111
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Community Specialist
Hey there showsley2017,
Do you notice if the storage amount updates after restarting your Mac? If not, test to see if the issue persists in safe mode, which will help rule out possible startup software and items that load at startup. The steps below will help:
Intel processor
1. Turn on or restart your Mac, then immediately press and hold the Shift key as your Mac starts up.
2. Release the key when you see the login window, then log in to your Mac.
3. You might be asked to log in again. On either the first or second login window, you should see ”Safe Boot” in the upper-right corner of the window.
How to use safe mode on your Mac - Apple Support
If it doesn't update the amount properly, test to see if this is a system-wide issue by creating a new user and checking there: Change Users & Groups settings on Mac - Apple Support
Should this persist, provide more details on where you're seeing this error and any other specifics that you feel will help.
Take care!