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Disk storage huge difference compare to components

I do not understand the disk storage use compare to its components storage used:

- At the Machine level, the Finder shows a use of 380Gb for the internal disk Macintosh HD.
- Macintosh HD shows components (Users, Application, Library and System) totalising 180Gb of use.

From past discussions, I understand that there are OS hidden items which can justify ± 20Gb (snapshots, VM, blocks allocated, item used, ...). OmniDiskSweeper justifies 20Gb indeed. But in this case, the difference is 200Gb.

Is this a difference between storage used vs allocated?

Is there an app or a tool that can analyse and report these 200Gb?

I use a late 2009 iMac 21.5" OSX 10.10.5 Yosemite which suits my needs but my concern is to determine wether the difference is ok or originated by faulty blocks which would need a disk replacement or a new machine.

Many thanks in advance

iMac, OS X 10.10

Posted on Apr 20, 2023 5:20 AM

Top-ranking reply

jean-mariefromrixensart Author

Level 1

6 points

Posted on Apr 20, 2023 6:13 AM

I have found all differences launching as an administrator from terminal using:

sudo /Applications/OmniDiskSweeper.app/Contents/MacOS/OmniDiskSweeper

Thanks to https://www.macobserver.com/tmo/article/how_to_recover_missing_hard_drive_space

I forgot that I was not alone on the computer during all these years.

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Disk storage huge difference compare to components

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