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#Create bootable external hard drive for mac sierra how to
#Create bootable external hard drive for mac sierra mac os x
#Create bootable external hard drive for mac sierra install

A 16GB or larger USB flash drive or a 16GB or larger partition on some other kind of external drive.

We've created a USB stick from both Mojave and Catalina, but your experience with other versions may vary.

A Mac that you have administrator access to.

Luckily, it's not hard to make one-either with a handy graphical user interface or some light Terminal use.

#Create bootable external hard drive for mac sierra install

Going back to the mounted Install ESD.Further Reading macOS 10.15 Catalina: The Ars Technica reviewĪpple hasn’t shipped operating systems on physical media in a full decade, but there are still good reasons to want a reliable old USB stick for macOS Catalina.Navigate the file structure to System | Installation and delete the alias to the Packages directory ( Figure J) Once the files have finished copying over, the drive should mount automatically.The process may indicate in excess of one hour, but in my experience, the process takes significantly less time to complete ( Figure I).Upon verifying that the fields are correct, click the Restore button and select Erase from the application, if prompted to do so ( Figure H).For Destination, drag and drop the partition created on the USB drive onto the textbox ( Figure G) Drag the BaseSystem.dmg over to the Source text box.Go back to Disk Utility and click on the newly formatted USB Drive in the menu, then click on the Restore tab.dmg file and locate the hidden BaseSystem.dmg ( Figure F) Navigate the file structure Contents | Shared Support and double-click the InstallESD.dmg file mount OS X Install ESD on the desktop ( Figure E).Right-click the file and select Show Package Contents ( Figure D)

#Create bootable external hard drive for mac sierra mac os x

Upon completion of the USB formatting, locate Install Mac OS X Mavericks.app (downloaded in step #1 to the Applications folder, by default).

Launch the Terminal.app by selecting it from the /Applications | Utilities folder and execute the following command ( Figure C)*:ĭefaults write AppleShowAllFiles TRUE \killall Finder \say Files Revealed.

Click on the Options button, select the radio button for GUID Partition Table, and click OK ( Figure B).

Select Mac OS Extended (Journaled) for the format-type from the drop-down menu ( Figure A).

Click the drop-down menu, selecting 1 partition.

Click on the USB drive from the left-hand menu and select the Partition tab.Insert the USB drive into the Mac and launch Disk Utility.Using a Mac with at least OS X 10.6.8 installed, access the Mac App Store and download the Mavericks (10.9) app installer.

User Account with Administrative privileges.

Apple computer with Mac App Store (OS X 10.6.8+).

Install OS X Mavericks.app (installer downloaded from Mac App Store).

Creating a USB Installer for Apple OS X 10.9īefore proceeding, you'll need the following items to complete the process:

However, the focus of this article is the change in the process for creating a working, bootable USB drive. The latest iteration of OS X, version 10.9 (aka Mavericks), marks not only 200+ changes in the OS, but also does away with the fabled "big cat" naming scheme.

#Create bootable external hard drive for mac sierra how to

In April, I wrote an article on TechRepublic about how to create a bootable USB to install OS X.