Reinstall Mac Os El Capitan
Mar 19, 2016 Note that by default, the Mac will start booting up directly to the external hard drive until you change it. The second method to install OS X is to restart the Mac and press and hold the COMMAND + R keys. This will load up OS X Recovery. The OS X Utilities screen will appear and here you want to click on Reinstall OS X. You may install the New OS X 10.11 El Capitan on an External Drive instead on your main drive, thus you take no risk erasing and re installing again the old.
- Download El Capitan installation from the App store. It might complain that you already have it installed but download it anyway. It will be downloaded to /Applications and be named Install OS X El Capitan.app
- Create a bootable image from the El Capitan installer on a USB stick larger than 6GB. In a terminal run:
Install El Capitan On External Drive
where MyVolume is the name of your USB stick. Change this to match the name of your USB stick.
- Physically install SSD into the target laptop.
- Insert the El Capitan USB stick into the target laptop and power up. (This might take a while.)
- When the menu finally turns up, choose Disk Utility and format the SSD as Mac OS Extended (Journaled) with a unique name.
- Once complete, exit from Disk Utility and return the main menu.
- Choose to Install OS X on the formatted SSD.
- Follow the prompts until El Capitan is installed.
Here’s link to a video on how to physically install the SSD as well as run the software installation.
Install El Capitan On External Disk
Puppy Linux Bootable Usb Drive
If you’d rather install Yosemite on the SSD then follow the How to Install Yosemite on a New SSD guide.