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Question: Fusion Drive Mysteriously filling up

I have a 3 TB Mac Hard drive.

For some strange reason, it seems to be filling up. I have nothing running, downloading.

Everything on the HD is less than 150GB... including apps, photos, Parallels Virtual Machine (130GB).

I have tried re-booting. Not running the VM. Nothing helps.

Can anyone please tell me what's happening and any fixes?

Much thanks.


Note screenshot of me system...


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Mar 16, 2018 1:11 PM in response to BHAJ In response to BHAJ

What do you see if you click on the Manage button? Maybe it will help with what is on the drive that you might delete.


How to Free Up Space on The Hard Drive


  1. You can remove data from your Home folder except for the /Home/Library/ folder.
  2. Visit The XLab FAQs and read the FAQ on freeing up space on your hard drive.
  3. Also, see Freeing space on your Mac OS X startup disk.
  4. Free up storage space on your Mac.
  5. See Where did my Disk Space go?.
  6. Be sure to Empty the Trash to recover the space.
  7. Replace the drive with a larger one. Check out OWC for drives, tutorials, and toolkits.
  8. Use OmniDiskSweeper or GrandPerspective to search your drive for large files and where they are located.

Mar 16, 2018 1:11 PM

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Mar 16, 2018 1:20 PM in response to Kappy In response to Kappy

I've done all the items mentioned in "manage".

I truly have only used 150GM of the total 3TB of HardDrive.

I have just talked to AppleCare. They are also surprised! They are "re-indexing" Spotlight and will call me tomorrow to see if that worked.

Fingers crossed.

I'll update this post if it works.

Mar 16, 2018 1:20 PM

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Mar 16, 2018 1:33 PM in response to BHAJ In response to BHAJ

Get Correct Storage Information


Do not use the information from the Storage section of the About This Mac dialog. Ignore the Storage information as it is typically wrong. To find out the correct information for any disk: Select a Desktop disk icon. Press Command-I to open the Get Info window and look at the topmost panel displayed. You will find the disk information displayed for Capacity, Available, and Used. If you have more than one disk/partition then repeat for each one on your Desktop.


If you do the above what results do you get? When you use the Manage button just what do you see? What do you see if you run OmniDiskSweeper or GrandPerspective?

Mar 16, 2018 1:33 PM

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Question: Fusion Drive Mysteriously filling up