Running First Aid on Macintosh HD

Hi to anyone who can help me.


Using a MBP (2,5 GHz Intel Core i7 - 16GB 1600 Mhz DDR3 - macOS Sierra 10.12) since a few months and I had more problems with it then with my previous MBP that I kept for over 5 years!


In Disk Utility, Mactintosh HD, First Aid found corruption that needs to be repaired.

I get into Recovery (Command + R) and chose Disk Utility.

I can chose APPLE SSD ... but I cannot chose Macintosh HD for Repair Aid!


So I'm blocked, what can I do? How can I do a repair on my Mac HD?


My computer is running a bit slow + is crashes all the time!

I never had that before!

Thanks for your help.

MacBook Pro with Retina display, macOS Sierra (10.12)

Posted on Oct 17, 2016 9:30 AM

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5 replies

Oct 17, 2016 10:06 AM in response to Baby-Boomer-USofA

How is this possible, brand new computer! I can't believe it. Is there no any other way how to solve it? OS X?


Another question, in Disk Utility on my MBP, I see APPLE SSD and Macintosh HD (here I can chose it and get the info that is has been corrupted), but I cannot see the Media disk.


On my Mac Server, when I try to run First Aid, it notes that it could not unmount the volume for repair ... what does that means?

Oct 17, 2016 12:02 PM in response to Lahdaki

On a Mac Server the drive is nearly always in use, and unmounting it is prohibited. To run a disk first Aid run there, I restart my Server in Safe Mode, and it does one pass of repair (takes an additional five minutes) on the boot drive ONLY as it starts up. You can them manually run a pass of First Aid on any additional data drives you have.


Safe mode loads only a minimal set of Apple-only extensions, and does NOT load the Server extensions, so to get your Server working a expected, you will have to reboot in regular mode again later. This will be slightly slower to start up (one time) because it will rebuild some system caches, including the kernel extensions cache.

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Running First Aid on Macintosh HD

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