{"id":"comparisons.storage-inspector-vs-about-this-mac-storage-bar","url":"/faq/comparisons/storage-inspector-vs-about-this-mac-storage-bar","category":{"id":"comparisons","title":"Comparisons & alternatives"},"subcategory":{"id":"built-in-macos","title":"macOS's own storage tools"},"question":"Why does Storage Studio's Storage Inspector show different numbers from the macOS storage bar?","alt_questions":["storage inspector numbers don't match about this mac","Why does System Settings storage disagree with Storage Studio?","mac storage bar vs storage studio measurement","which storage number is right, macOS or Storage Studio","different free space in finder and storage studio"],"short_answer":"macOS groups storage into broad categories; the Storage Inspector measures folders directly and says what it couldn't read. Space still held by your Mac's own snapshots is also shown separately, which explains most gaps.","answer_markdown":"They measure in different ways, so small differences are normal. The macOS storage bar groups everything into broad categories and folds a lot into \"System Data\". The **Storage Inspector** walks your folders and reports what it actually measured, folder by folder — and when parts of the disk are off-limits to every app, its footer says so rather than guessing.\n\nThe other common reason is **held space**. After you delete or move something, your Mac's own recent snapshots can keep that space taken for a while. Storage Studio shows this separately as *Pinned* (or \"held for now\"), while some macOS views count it as free or purgeable.\n\nIf you want the space back now, the [Local Snapshots manager](/manual/local-snapshots) can release snapshots that are already backed up. More in [What's Using Space](/manual/whats-using-space).","answer_html":"

They measure in different ways, so small differences are normal. The macOS storage bar groups everything into broad categories and folds a lot into "System Data". The Storage Inspector walks your folders and reports what it actually measured, folder by folder — and when parts of the disk are off-limits to every app, its footer says so rather than guessing.

\n

The other common reason is held space. After you delete or move something, your Mac's own recent snapshots can keep that space taken for a while. Storage Studio shows this separately as Pinned (or "held for now"), while some macOS views count it as free or purgeable.

\n

If you want the space back now, the Local Snapshots manager can release snapshots that are already backed up. More in What's Using Space.

","answer_text":"They measure in different ways, so small differences are normal. The macOS storage bar groups everything into broad categories and folds a lot into \"System Data\". The Storage Inspector walks your folders and reports what it actually measured, folder by folder — and when parts of the disk are off-limits to every app, its footer says so rather than guessing.\n\nThe other common reason is held space. After you delete or move something, your Mac's own recent snapshots can keep that space taken for a while. Storage Studio shows this separately as Pinned (or \"held for now\"), while some macOS views count it as free or purgeable.\n\nIf you want the space back now, the Local Snapshots manager can release snapshots that are already backed up. More in What's Using Space.","tags":["storage inspector","system data","measurements"],"related":[{"id":"comparisons.storage-studio-vs-macos-storage-settings","question":"How is Storage Studio different from the Storage section in macOS System Settings?","url":"/faq/comparisons/storage-studio-vs-macos-storage-settings"},{"id":"comparisons.local-snapshots-manager-vs-tmutil","question":"Is the Local Snapshots manager any different from deleting snapshots with Terminal?","url":"/faq/comparisons/local-snapshots-manager-vs-tmutil"}],"applies_to":"all","last_reviewed":"2026-10-01","title":"Why does Storage Studio's Storage Inspector show different numbers from the macOS storage bar? — Storage Studio FAQ","description":"macOS groups storage into broad categories; the Storage Inspector measures folders directly and says what it couldn't read. Space still held by your Mac's own snapshots is also shown separately, which explains most gaps.","crumbs":[{"name":"Home","path":"/"},{"name":"FAQ","path":"/faq/"},{"name":"Comparisons & alternatives","path":"/faq/comparisons/"},{"name":"Why does Storage Studio's Storage Inspector show different numbers from the macOS storage bar?","path":"/faq/comparisons/storage-inspector-vs-about-this-mac-storage-bar"}],"jsonld":{"@context":"https://schema.org","@type":"FAQPage","url":"https://storagestudio.us/faq/comparisons/storage-inspector-vs-about-this-mac-storage-bar","inLanguage":"en","dateModified":"2026-10-01","mainEntity":[{"@type":"Question","name":"Why does Storage Studio's Storage Inspector show different numbers from the macOS storage bar?","alternateName":["storage inspector numbers don't match about this mac","Why does System Settings storage disagree with Storage Studio?","mac storage bar vs storage studio measurement","which storage number is right, macOS or Storage Studio","different free space in finder and storage studio"],"acceptedAnswer":{"@type":"Answer","text":"They measure in different ways, so small differences are normal. The macOS storage bar groups everything into broad categories and folds a lot into \"System Data\". The Storage Inspector walks your folders and reports what it actually measured, folder by folder — and when parts of the disk are off-limits to every app, its footer says so rather than guessing.\n\nThe other common reason is held space. After you delete or move something, your Mac's own recent snapshots can keep that space taken for a while. Storage Studio shows this separately as Pinned (or \"held for now\"), while some macOS views count it as free or purgeable.\n\nIf you want the space back now, the Local Snapshots manager can release snapshots that are already backed up. More in What's Using Space.","url":"https://storagestudio.us/faq/comparisons/storage-inspector-vs-about-this-mac-storage-bar"}}]},"fragment":"
\n
\n\n\n\n\n
\n
\n

Comparisons & alternatives · macOS's own storage tools

\n

Why does Storage Studio's Storage Inspector show different numbers from the macOS storage bar?

\n

Short answer: macOS groups storage into broad categories; the Storage Inspector measures folders directly and says what it couldn't read. Space still held by your Mac's own snapshots is also shown separately, which explains most gaps.

\n

They measure in different ways, so small differences are normal. The macOS storage bar groups everything into broad categories and folds a lot into "System Data". The Storage Inspector walks your folders and reports what it actually measured, folder by folder — and when parts of the disk are off-limits to every app, its footer says so rather than guessing.

\n

The other common reason is held space. After you delete or move something, your Mac's own recent snapshots can keep that space taken for a while. Storage Studio shows this separately as Pinned (or "held for now"), while some macOS views count it as free or purgeable.

\n

If you want the space back now, the Local Snapshots manager can release snapshots that are already backed up. More in What's Using Space.

\n\n

Last reviewed

\n\n

Related questions

\n

Also available as Markdown and JSON.

\n
"}