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Once Disk Utility has loaded, choose the disk you wish to repair - the default name for your system partition is generally "Macintosh HD", and choose 'Repair Disk'.

Select Disk Utility from the macOS Utilities menu.

Restart your Mac, and press Command + R, while it's restarting.

If trying to repair the internal partition where your Operating System is installed, you'll need to boot into Recovery mode, so your Mac can check and repair files that are "in use".

If using an external disk, then choose 'Repair Disk', and allow the process to complete.

It should give you some diagnosis to confirm whether your drive is viable, or needs to be repaired. Once you've loaded Disk Utility, select 'Verify Disk' and allow your Mac to check the disk. You can locate Disk Utility within your Applications -> Utilities folder, or by searching "Disk Utility" in Spotlight. This requires the computer to be booted in Recovery mode, and as repairing the internal partition can have serious repercussions, we advise performing a back-up of any crucial data before proceeding.

It can also be used on your internal partition if you are having trouble with OS X.

The most obvious example would be when there is drive corruption caused by improperly removing external USB storage. Not sure why you have 2 Macintosh HD but the new apfs file system splits system from data, see below: Introducing APFS volume groups Before we get to it, it’s important to first get you up to speed with the concept of a new APFS (Apple File System) feature in Catalina, called volume groups. Repairing Disks using OS X's Disk Utility can be a useful way to improve performance, and in some scenarios, recover lost data. Given that all of my files and applications, etc., are there when I load up the computer obviously the SSD is mounted, but strangely isn't showing up in recovery mode? I am now assuming that this is the reason (or part of the reason) why it occasionally wouldn't boot?Īt the time, I assumed there is a physical connection problem, a cable problem, or a physical problem with the drive, but now I am not sure.As much a we all try to protect our computers, sometimes issues do arise with the drives where you store your data. In order to wipe it, I rebooted it and entered recovery mode, and when I went into Disk Utility, the Macintosh HD / SSD was not present (not greyed out - completely missing) only the recovery drive was present (cannot recall the exact name - I think its like <2gb and has a copy of the OS on it).

Not Showing Up on a Mac How to Format a Mac Hard Drive With Disk Utility How to.

I ended up buying a new computer because it was so unreliable, and am now looking to repair it.Īfter sitting the in drawer for 6 months the computer actually loaded up just fine as normal, and I was able to sign out of Apple ID, etc., and backup whatever I needed. Repair Your Macs Drives With Disk Utilitys First Aid GASREGULAR Menu. Staring a few months ago, the computer would intermittently not boot (black screen with a flashing folder with a ? in the centre). I have a MacBook Pro Retina 15" Late 2013 running Big Sur Version 11.1.