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Help, restored Macintosh HD to OS X Base System

Help! I accidentally restored Macintosh HD to OS X Base System. Didn't know that would cause issues... I can only open my laptop through the Command+R thing with macOS Installer.

I was just trying to delete everything and start my Macbook fresh. I tried to re-install OS X Sierra, and it keeps failing. When I go to disk utility under internal, there's no Macintosh HD there's only OS X Base System.

Tried to ask Apple Support for help and they first told me to try first aid and that failed.

They told me to go to a service center, but I wanted to see if there are any solutions I could try.

Thanks!

It's a 2015 Macbook Pro.

Resetting NVRAM then install OS X could works.

How to reset NVRAM on your Mac - Apple Support

The OS X Base system should be a disk image a little over 2 GB in size. Is that all you see? Maybe indented under something called "Apple disk image Media".

So do you also see a hard disk icon identified by a brand name, such as "Apple SSD"? If so, when you highlight it, what does it say in the white box underneath in terms of partition map and capacity? Is it called "disk0" at the bottom right? Does it look like it might be your real hard drive?

If so, what happens if you try to erase it? You should get a drop down that gives you a place to enter a name (Macintosh HD), a format that says "Mac OS Extended (Journaled), and a scheme called "GUID Partition Map". If this is really your hard drive, then this step should recreate your Macintosh HD volume.

If that works, you should be able to continue with the installation of macOS.

Good luck!

When I try to erase the "APPLE SSD" thing it says: "Erase Process has failed." and the details say:
"Unmounting disk
Couldn't unmount disk.

Operation failed..."

Have you tried INTERNET RECOVERY (COMMAND + OPTION +R):

https://osxdaily.com/2014/12/14/reinstall-os-x-mac-internet-recovery/

https://support.apple.com/en-us/HT201314

Ciao.

Is that different from what happens when I do Command+R when it starts up?

Yes it is. You are accessing the utilities online instead of from your internal SSD.

Hi to anyone else who accidentally restored the macintosh he with the OS X base System here are a few steps to follow to hopefully resolve your issues:

• enter internet System recovery be restarting your   MacBook and immediately pressing control+option+R.

• wait for it to load and the macOS utilities or OX S utilities should pop up.

• then enter the driver utilies

• under internal where it says OS X base System, click erase

• rename the drive Macintosh HD

• make sure the format is Max OS Extended (Journaled)

• hit erase one more time

• Then exit driver utilities

• Enter Reinstall MacOS Sierra or Reinstall OS X

• Then Select the Macintosh HD drive

• Reinstall MacOS Sierra or Reinstall OS X

• finally your MacBook should be back to normal and good as new.

WaffleFallafle wrote:

 

• enter internet System recovery be restarting your   MacBook and immediately pressing control+option+R.

That should be COMMAND, not control.  You may be better served by this link:

https://osxdaily.com/2014/12/14/reinstall-os-x-mac-internet-recovery/

Ciao.

Very Helpful post!

just to add, although system said it takes 6 mins to install, is more like 60mins!

Thank you. This seems to be working

Thanks. This seems to be working

Thanks a lot!!

• wait for it to load and the macOS utilities or OX S utilities should pop up.

• then enter the driver utilies

• under internal where it says OS X base System, click erase

• rename the drive Macintosh HD

• make sure the format is Max OS Extended (Journaled)

I get to this point and it always says failed, I can not format the drive

I couldn't do anything but I used COMM+R to get to Disk Utility and reloaded an earlier version from Time Machine. All working fine now.

最后更新：2017-08-21 18:06:06

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