Mac Re-install the OS: Difference between revisions

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OS X Utilities -> Disk Utility  
OS X Utilities -> Disk Utility  


First delete the partition from Disk Utilities: macOS Utilities -> Disk Utility -> Select Internal -> <''Partition Name''> from the left tab -> Erase -> Specify the new name and the format: APFS (Case-sensitive) -> Erase. The process should end with a message similar to "Erasing "<''Old Partition Name''> and creating "<''New Partition Name>''".
{{Warn|Reinstalling without explicit deletion of the partition will upgrade and preserve the data}}


Then "Reinstall OS X". Reinstalling without explicit deletion will upgrade and preserve the data.
First delete the partition from Disk Utilities: macOS Utilities -> Disk Utility -> Select Internal -> <''Partition Name''> from the left tab. Usually the partition is named "Macintosh HD" -> Erase -> Specify the new name and the format: APFS (Case-sensitive) -> Erase. The process should end with a message similar to "Erasing "<''Old Partition Name''> and creating "<''New Partition Name>''" -> Done.


Local the drive you want to erase (usually it's the only one, and it's named "Macintosh HD".
Then go back to macOS Utilities -> "Reinstall OS X".  


Erase "Macintosh HD"?
Select the drive -> Install.
 
You can preserve the current name, and choose a format: OS X Extended (Case-sensitive, Journaled) -> Erase.


==Adding a new volume to the container==
==Adding a new volume to the container==

Revision as of 22:23, 13 October 2018

External

Internal

Re-install with Data Deletion

El Capitan: Command + R while restarting.

Other: Command + Option + R while restarting.

OS X Utilities -> Disk Utility


Reinstalling without explicit deletion of the partition will upgrade and preserve the data

First delete the partition from Disk Utilities: macOS Utilities -> Disk Utility -> Select Internal -> <Partition Name> from the left tab. Usually the partition is named "Macintosh HD" -> Erase -> Specify the new name and the format: APFS (Case-sensitive) -> Erase. The process should end with a message similar to "Erasing "<Old Partition Name> and creating "<New Partition Name>" -> Done.

Then go back to macOS Utilities -> "Reinstall OS X".

Select the drive -> Install.

Adding a new volume to the container

Apple File System (APFS) is preferable, as it's the newest and optimized for SSDs.

Select the container disk or "APPLE SSD ... MEDIA".

Add a new volume with the + icon.

Name

APFS Case Sensitive

Installation

Then go back to OS X Utilities -> Reinstall OS X.

If I get "The recovery server could not be contacted", it is probably because the time is out of sync, so go to Utilities -> Terminal and 

ntpdate -u time.apple.com

The computer must be connected to the Internet (wire or wireless): Utilities -> Network Utility.

Re-install without Data Deletion

Create a Bootable USB

https://support.apple.com/en-us/HT201372

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