Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes. Select the volume containing the bootable installer, then click Continue. When the macOS installer opens, follow the onscreen instructions. Intel processor Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
Release the Option key when you see a dark screen showing your bootable volumes. Select the volume containing the bootable installer. Then click the up arrow or press Return. If you can't start up from the bootable installer, make sure that the External Boot setting in Startup Security Utility is set to allow booting from external media. Start the utility disk. You can find it under the Applications category or search it using Spotlight.
As utility disk runs in the background, you can check for the format of the external drive. In the following example, the drive is in Master Boot Record format. First, unmount the drive. After unmounting, you can select the same drive from the left of the window as shown in the figure below. Now, from the tabs that appear in right window, choose "Erase" option.
If you choose to, you can also give it a name. Press "Erase" to proceed. After completion, you will see the following screen. Press "Done" to proceed. If you are opting windows, then you would get the option of upgrading or performing a custom installation.
If you are upgrading your older version into a new one, it is recommended to start from scratch. It will omit all errors and issues that come along while the process is in progress. On other hand, if you want a dual OS, then you would be given the options if you want to install the Linux along with the windows or you want to erase the disk and then install Linux. In the first case, you would be asked how much disk space you want to allot to the Linux.
Before the installation of the new operating system on the drive, you have to format the partitions. It will create the unallocated space required for installation. In this space created, you have to create a new partition to support the process of installation. For installing the Linux, the partitions should be formatted in an Ext4 format. If you are installing Linux, the installer would ask for your time zone.
You need a user ID and password to enter the Linux distribution and to command the changes and configurations. In the case of windows, the users have to enter the personal information once the process of installation is completed. Once the installation is initiated, next it depends on the speed of your device that how much time it would take to complete.
During the installation, your device will reboot several times. You have to create a user ID as a windows login. Other credentials can also work. Once you enter the personal login credentials, you have to enter the product key, for windows to be accessed completely. Windows 8 users have to select the color schemes and they would be asked if they are logging in with Microsoft account or user ID. As the process of OS installation is completed, your device will reboot and the new desktop will appear on the screen.
The next step is to install the applications and essential programs along with the system drivers. Keep your drivers up to date. This can be useful for a couple of different reasons. Firstly, it allows you to run another copy of OS X without needing any additional Mac computer. Also, since you can run a full copy of OS X on the external drive, it can be used for troubleshooting purposes on other Macs or it can be as a kind of virtual OS X.
Using an external drive, you can save space on your Mac, though it might be a bit slower if you are using USB 2. To do this, open Disk Utility and connect the drive to your Mac. Under External in the left hand menu, click on your external hard drive and then click on the Erase button.
Make sure you backup any data before you erase the drive. When macOS Sierra is downloaded, it is saved in your Applications folder. Double-click the installer to begin. Feel free to grab a cup of coffee or take a shower, because it will take a few minutes. Before macOS can complete installation, your computer will need to restart. Once your Mac restarts, it will take about 15 more minutes to finish, and will then boot automatically from the new device.
You will then need to go through the usual macOS setup, including enabling Siri, setting up your time zone, and adding your user account. In order to select a different Startup Disk, you will need to click the lock in the lower-left corner.
A confirmation dialog will appear asking you to confirm your wishes. Read on…. Or maybe you want to use your portable macOS installation on another compatible Mac. From there, you can select your external drive and click the arrow to boot into it for that session. The next time you restart that Mac, it will boot to main, internal hard drive as normal.
Or you can hold Option and boot to the external drive again, if needed. The whole process should take less than an hour, and once completed, you will have an untouched macOS installation on an external device that you can use in case of emergencies or just for fun. Furthermore, you should be able to boot your portable macOS installation on any Sierra-compatible Mac, meaning you can carry your own personalized Mac desktop with you wherever you go. Browse All iPhone Articles Browse All Mac Articles Do I need one?
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