It counts everything first.
Every file, every folder, true recursive sizes. The numbers start moving before the first second is up, and the folder that quietly took over stops hiding behind three subfolders.
Drive Inspector · free for Mac
Point it at a drive. Get the space back.
Drive Inspector finds every file your drive is storing twice, matched on contents, never on filename, and confirmed with a full SHA-256 hash. Click any one of them to reveal it in Finder and clear it out. On the way it tells you your codecs, your biggest folders, and where the space actually went.
Reads the drive. Never writes to it.
SANDBOX‑VOLUME‑01 2 TB
Complete
Files1,6531,316 media
Photo6747.21 GB
Footage623 clips441.36 GB
Reclaimable13.99 GB33 extra copies, 30 groups
Codec and resolution
Duplicate verification
Media files1,316
Verified groups30
Extra copies33
Reclaimable13.99 GB
Real scan · SANDBOX-VOLUME-01 · 27 Aug 2026
The scan
Pass 01 · Walk
Pass 02 · Read
Pass 03 · Hash
Pass 04 · Report
Then it reads the headers.
Codec, resolution, frame rate, duration, camera make and model, capture date, pulled straight from the container. It never decodes a frame, which is why it stays fast on a full volume.
Then it proves the duplicates.
Group by exact byte size. Partial-hash the survivors. Full SHA‑256 anything still standing. Filenames are ignored entirely: two files match because their contents match, or they do not match at all.
And hands you a number.
Only verified extra copies of files over 4 MB count toward it, so it is a floor rather than an optimistic estimate. Take it to the person who signs off on storage.
SANDBOX‑VOLUME‑01 2 TB
Complete
Files1,6531,316 media
Photo6747.21 GB
Footage623 clips441.36 GB
Reclaimable13.99 GB33 extra copies, 30 groups
Codec and resolution
Duplicate verification
Media files1,316
Verified groups30
Extra copies33
Reclaimable13.99 GB
Real scan · SANDBOX-VOLUME-01 · 27 Aug 2026
What it does
Two files, one set of bytes.
A list of duplicate paths is not much use if you then have to hunt each one down by hand. Every result is a button: click it and the file is revealed in Finder, selected, ready to drag to the trash.
Duplicate group · SHA‑256 verified
3.76 GB × 2, 3.76 GB recoverable
1 of 2 selected · 3.76 GB
Pick a copy. The window follows. Drive Inspector never deletes anything itself.
The report
A report you can hand to someone.
Most disk tools draw you a sunburst chart and leave you to interpret it. This one produces a file you can send to someone: self-contained, logos inlined, opens offline in five years on a machine that has never heard of Vaultline.
SANDBOX-VOLUME-01, drive report
27 AUG 2026 · 1,653 files
Video · 623 clips441.36 GB
/26-006_Drone-Reel/…/CAMERA/DRONE/DJI_0216.MP43.76 GB
/26-006_Drone-Reel/07_EXPORTS/…_INTERNAL_v002.mp43.76 GB
Photo · 674 files7.21 GB
Verified duplicates · 30 groups13.99 GB
Empty folders31
HTMLCSV
HTML to forward, or to print to PDF from any browser and staple to the storage request. CSV when you want to do your own arithmetic on all of it.
Trust
Sandboxed, read-only, offline.
It cannot phone home. Not a privacy policy. Not a pinky promise in a footer. The app ships without the network entitlement, which means macOS itself will not let it open a socket: there is no code path, and no permission to take.
Run this on the DMG before you ever launch it.
If you find a network entitlement in that output, do not install it.
$ codesign -d --entitlements :- \
/Applications/VaultlineLabsDriveInspector.app
<!-- sandbox on -->
com.apple.security.app-sandbox true
com.apple.security.files.user-selected read-write
<!-- what is NOT there -->
com.apple.security.network.client absent
com.apple.security.network.server absent
com.apple.security.files.downloads absent
The boundaries, in full
Five sentences, each one a thing the app cannot do.
- Reads drives, never writes
It reads drives and never writes to them, and it never writes to the volume it scanned.
- No delete of any kind
It has no delete capability in the app at all.
- No network entitlement
It ships without a network entitlement, so it cannot send anything anywhere.
- Local only
Local only, nothing uploaded, nothing deleted.
- macOS 13 or later
Natively on Apple Silicon and Intel, macOS 13 Ventura and later.
The file entitlement reads read-write and only ever applies to folders you pick yourself. Drive Inspector writes exactly one thing, and only when you ask: the report you export, to the location you choose in the Save panel.
Free download
Scan your first drive.
Two fields and the download link appears right here, no inbox trip, no waiting. We also send the occasional note about the tool, and one reply gets you off it.
It is yours.
Drive Inspector 0.3.2, signed and notarized, so it opens like any other Mac app.
Download for MacSHA‑256 ·
Drive Inspector 0.3.2 · macOS 13 or later · about a minute on our 2 TB test volume
Free · nothing uploaded
Find out what is on the shelf.
Worst case, your drives are in better shape than you feared, which is also worth knowing before the next storage invoice lands.
Download for Mac
Free · signed and notarized · nothing uploaded