I’ve used DaisyDisk to analyse my file usage on my MacBook Pro (mid–2012), but the numbers aren’t adding up. Of 500GB, it shows ~425GB used, but the breakdown only adds up to 280GB. The diagram itself shows a big gap, so what’s going on? What else can I use to track down this drive usage? I’ve attached a screen grab of my DaisyDisk analysis.

Screengrab of DaisyDisk analysis

Using the Disk utility and the Storage tab from About this Mac doesn’t reveal anything useful either, see following screen grabs:

Screen grab from About this Mac

  • One of these answer might help you: apple.stackexchange.com/questions/44877/… – Joonas Jan 19 '16 at 9:13
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    Are you running DaisyDisk as an admin user? If not, see if the results are different when you do. – calum_b Jan 19 '16 at 12:28
  • The existence of the lost+found directory indicates an issue with your file system. Back-up your hard drive and run disk utility from the Recovery partition or run fsck in single user mode. – fd0 Jan 19 '16 at 14:49
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    Thanks everyone, @Joonas’ lead got me to the right place. Doing a scan as an admin helped, but it wasn’t apparent that was possible as I was using a version of the app downloaded from the Mac App Store. For anyone reading this later, the developers have made it easy to switch to a version from their own site that permits scanning the entire Mac HD as an admin. – Anthony Noel Jan 19 '16 at 18:56

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