Freeing up space · What's Using Space (Storage Inspector)
What does the What's Using Space window show me?
Short answer: It's the window that shows what's really on your disk, measured on your Mac: what changed since last time, your biggest folders to any depth, space held by backups, and common quick wins.
What's Using Space is the window that shows what's actually on your disk — measured on your Mac, not estimated. It has four main parts:
- What changed — what grew since the last measurement, split into Gone, Pinned and Reclaimed.
- Biggest on this disk — your largest folders, which you can drill into to any depth.
- Space held by backups — how much your Mac's local snapshots hold and how old it is.
- Known quick wins — common caches and leftovers.
Rows Storage Studio can act on have a Move to fast drive button, and Relocated in the header lists everything already moved. Open it from the More menu ••• → What's Using Space. Full detail: What's Using Space manual.