#Open disk utility at startup mac mac#

When your Mac restarts, press Command + R and hold the keys until the Apple logo appears.

Click on the Apple menu (top left corner), choose Restart.

YouвЂ™ll lose access to it after you restart your Mac later.

Print this article or open it on any other device.

If it fails, the only alternative is backing up your data and getting a new disk. ThatвЂ™s only possible if your disk can be saved by means of MacвЂ™s native app, Disk Utility.

#Open disk utility at startup mac how to#

How do I know if I need a new hard drive?Д®ach of these posts has detailed answer and references on how to replace your drive, and even do a memory upgrade while you have it open.WeвЂ™ll go over how to perform hard disk repair on Mac using software solutions.

My Mac is getting really slow, what should I do? There are a couple of other posts here on Ask Different that go into this exact procedure. You didn't mention which Mac you have specifically but replacing a hard drive is actually quite easy. If you have a post-June 2013 product, launching Diagnostics is the same procedure, just a different set of tools. Simply hold down the D key while booting from a powered off state (power supply plugged in if you are on a Macbook) and then run the 'Extended Diagnostics'. I am just going to guess and say you have a pre-June 2013 Mac Product, so you will run Apple Hardware Test. Most often it is because the HDD is beginning to fail and bad sectors are cropping up.

OS X usually doesn't get corrupt unless the user does something very outlandish and very deliberate. If it returns back anything but the word 'Verified', your drive is crashing. Just make note of which one is labeled 'Macintosh HD' as you noted in your question. Chances are it will be /dev/disk0, but it may be different. Check the SMART status.Д«oot like you described,then run the command: To verify that this is the case, there are a couple steps to take. Web and there are many solutions out there, but none worked form me. To single-mode and mount the hard drive with mount -uw / and thenД®xit. With corrupted I mean, I can boot my system only if I go My OS is corrupted, that is the reason why I want to do a fresh I am basing my reasoning off this statement: I suspect that your hard drive is in the process of crashing. Here is an image when I try to erase the partition via Disk UtilityДЄnd here is an image when I try to reinstall the OS. I tried also fsck, it did not do any good.

But still I can not use diskutil in single-mode. So I tried loading the files manually with launchctl. But this did not work because the DiskManagement Framework was missing. I tried erasing and formatting the hard drive when in single-mode with the help of diskutil. I search everywhere in the web and there are many solutions out there, but none worked form me. With corrupted I mean, I can boot my system only if I go to single-mode and mount the hard drive with mount -uw / and then exit. My OS is corrupted, that is the reason why I want to do a fresh installation. The problem is Disk Utility is stuck at loading and does not show anything.

So I close the installation and went to Disk Utility.

#Open disk utility at startup mac install#

When it came to choose the destination disk where I wanted to install the OS, it did not show any hard drive, i.e Macintosh HD was not shown so I could select it. I booted to recovery mode, chose reinstall os x and followed the steps. I want to do a clean install of el capitan OS.