Mac Re-install the OS

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Revision as of 21:24, 25 September 2018 by Ovidiu (talk | contribs) (→‎Installation)
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External

Internal

Re-install with Data Deletion

El Capitan: Command + R while restarting.

Other: Command + Option + R while restarting.

OS X Utilities -> Disk Utility

First delete the partition from Disk Utilities, then "Reinstall OS X". Reinstalling without explicit deletion will upgrade and preserve the data.

Local the drive you want to erase (usually it's the only one, and it's named "Macintosh HD".

Erase "Macintosh HD"?

You can preserve the current name, and choose a format: OS X Extended (Case-sensitive, Journaled) -> Erase.

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.


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