Most USB flash drives are formatted for use with Windows. The process for formatting your flash drive is very similar to what is outlined above. We prepared the USB flash drive by partitioning and formatting it and then enabling ownership. The flash drive will now appear to the OS X installer as just another hard drive that is ready for installation of OS X. Having said that, we recommend that you customize the software packages that OS X will install. Before you begin the installation, a few notes about the process.
As we mentioned earlier, USB flash drives are much slower at writing data. When we performed the installation, it took about two hours. You can expect to see plenty of beach balls and slow responses as you work your way through the installation process. If speed is a big issue for you, you can entertain the idea of purchasing a small SSD in a portable enclosure.
How to create a bootable installer for macOS Catalina
Some manufacturers are making SSDs that are just slightly larger than the standard flash drive. Of course, you will pay a premium for the speed.
A bootable USB flash drive will help you get your Mac back to working condition, by letting you use all of the tools a fully-working Mac has available. In addition to being able to use Disk Utility, the Finder, and Terminal, and have access to the Internet, you can also load some specific emergency tools onto your USB flash drive. Here are some of the utilities we suggest installing. Share Pin Email. Tom Nelson has written hundreds of articles, tutorials, and reviews for Other World Computing and About.
He is the president of Coyote Moon, Inc. All data on your flash drive will be erased. In the list of drives attached to your Mac, select the USB flash drive device.
Like lumber, hard drives and flash drives are actually slightly smaller than their specs would have you believe. Enter a descriptive name for your flash drive; we chose Boot Tools. Click OK. A sheet will drop down, warning you that you are about to erase all data from the disk.
Click Partition. Disk Utility will format and partition your flash drive. You should be able to identify the USB disk by its size.
How to create a bootable USB to install OS X
To avoid confusion, I would suggest that you should have just one USB drive plugged in. Where N is the device number for the USB you got previously. So, in my case, the above command becomes:. And finally we come to the final step of creating the bootable USB drive.
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We shall be using dd command which is a very powerful and must be used with caution. Use the following command in terminal:. Here, we are using dd copy and convert to copy and convert input file if IMG to diskN. I hope you remember where you put the converted IMG file, in step 3. For me the command was like this:. As we are running the above command with super user privileges sudo , it will require you to enter the password.
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It will take a few minutes for the process to complete. Everything is just fine. Go back to the terminal. For me it was:.
macOS Catalina Bootable USB Requirements
Now, in the terminal use the following command to eject our USB disk:. N is of course the device number we have used previously which is 2 in my case:. Once ejected, click on Ignore in the dialogue box that appeared previously. Now your bootable USB disk is ready. Remove it from the system. Stay tuned. I am an avid Linux lover and open source enthusiast. I use Ubuntu and believe in sharing knowledge.
Apart from Linux, I love classic detective mysteries. I'm a huge fan of Agatha Christie's work. Thanks for the step-by-step guide.
I found this guide more useful than using Etcher. Could you provide a link to it? Thanks for making this article, it was exactly what I was looking for in order to write a Clonezilla. Thanks Abhishek!!! Your article was the only one that worked for me on Mac Os X Please log in again.
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