How Can I Use My Ssd Just For Booting My Osx And My Hdd For Everything Else

How to format your external drive for Mac You'll need to start with a clean thumb drive or hard drive in order to get it ready to work as a bootable drive. • Plug the USB end of the drive to a USB port on your Mac. • Click on Finder in your Dock to open a Finder window.

• Select Applications from the list on the left side of the window. • Scroll down and double-click on Utilities.

Alternatively, replace the HDD with the SSD and then connect the HDD to your computer with an external drive enclosure. A USB drive enclosure converts your drive's SATA connector to USB format so that you can use it as a removable medium.

• Scroll down and double-click on Disk Utility. • Select your drive under External. • Click on the Erase tab at the top of the window. • Note the name of your external hard drive (probably 'Untitled') because you will need it when you create a bootable drive. If you have more than one external hard drive named 'Untitled,' you will need to rename your hard drive now.

• If your Mac is using HFS+, select Mac OS Extended (Journaled) from the format list. If your Mac is using APFS, select APFS from the format list. • If Scheme is available, select GUID Partition Map. • Click Erase. • Click Done when the process is complete. • Close the Disk Utility window.

Your thumb drive or external hard drive is now ready. How to make your external drive bootable for installing macOS High Sierra Important:You will need to be in your Mac's administrator account in order to run the sudo Terminal command. • Click on Finder in your Dock to open a Finder window. • Select Applications from the list on the left side of the window. • Scroll down and double-click on Utilities. • Scroll down and double click on Terminal.

• Recall the name of your when entering the following text into Terminal. If it is not named 'Untitled,' you will need to change the command syntax for the pathname where it says: Volumes/Untitled.

The name of the drive can't have any spaces and it is case sensitive. • Enter the following text into Terminal ( Don't forget to change the name 'Untitled' if your hard drive is named something else): sudo /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install macOS High Sierra.app • Hit the enter/return key.

• Enter your administrator account password. This is the password you use to make changes on your Mac or log in. Windows authentication on mac for printing format. No text will appear in Terminal when you enter the password. The process could take a very long time, depending on the drive. When it is done, the Terminal window will report 'Done.' How to use macOS High Sierra with an installer boot drive Once macOS High Sierra is installed on your external drive, you can boot up and install any Mac with the drive plugged into it. • Turn off the Mac you want to install macOS High Sierra with the bootable drive.

• Connect the external drive to your Mac via the USB port. • Turn on your Mac. • Hold down the Option key when you hear the startup chime.

• Select the external drive with macOS High Sierra on it from the list of systems to start up your computer. The installation process will begin. Follow the steps to install macOS High Sierra onto your Mac or partitioned hard drive. Do you have any questions about how to create a bootable installer drive for macOS High Sierra? Let us know in the comments. Updated September 2018: Updated for the public release of macOS Mojave.