Mac storage basics · When the disk is full

Why does my Mac say there isn't enough space to copy a file when Finder shows plenty?

Short answer: Usually purgeable space counted as available but not yet freed, or a FAT32 destination that can't hold files of 4 GB or more. Release snapshots or reformat the drive.

Two common reasons:

  • Purgeable space: Finder counts space macOS could free (snapshots, cached cloud files) as available, but the copy needs it free now. Releasing local snapshots or making cloud files online-only fixes it.
  • The destination's format: a drive formatted MS-DOS (FAT32) can't hold files of 4 GB or more and reports it as a space problem.

Also check you're copying to the drive you think — the error is about the destination, not the source.

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