Macbook air 100 GB hidden space + error when verifying volume
Forget the space calculations if your disk has accounting errors.
- Back up any data that’s not already safe.
- Try repairs until you’re out of patience or feel it’s not going to work
- Erase the drive (Apple support erase install guide is below - search for erase or format)
- Re-run the disk check.
- If you have a clean check, then validate the storage settings before you load any data. Erase again if you aren’t convinced the clean install is correct.
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Seek hardware service or repair if the check won’t pass after two erases.
- https://support.apple.com/en-us/HT204904