Create a Bootable macOS Sierra Install Drive with DiskMaker X

Apple has made macOS installations (and those for Mac OS X before it) as simple as hitting a download link, but what if you’d like to have a bootable disk drive with which to install macOS Sierra on a number of different Macs? Fortunately, there’s a quick and free solution in the form of DiskMaker X, which has just become available in a macOS Sierra-compatible version. In this post, we’ll demonstrate how to create your own bootable install drive.

Download DiskMaker X 6

The first thing you’ll want to do is download DiskMaker X 6 to a Mac using the link above. Note that although DiskMaker X is free of charge, donations are accepted — you can help support a useful utility by sending the developers what you feel the app is worth.

Install DiskMaker X 6

To install DiskMaker X 6, find the installer disk image file — usually in the Downloads folder — and double-click it. The disk image is mounted, and the following screen appears:

DiskMaker X 6 Installer Screen

DiskMaker X 6 Installer Screen

Installation is simple — just drag the DiskMaker X 6 icon to the Applications folder alias as shown on the installer screen. Within seconds, the app is installed and ready for launch. But don’t double-click that app icon yet…

Download the macOS Sierra installer

Chances are good that when macOS Sierra was installed on your Mac, the installer file disappeared. That’s OK — you can download it by launching the Mac App Store, locating and clicking on the link for macOS Sierra in the right sidebar, then clicking the “Download” button. A copy of the installer is downloaded and saved into the Applications folder.

OWC 16GB USB Flash Drive

OWC 16GB USB Flash Drive

Get a suitable USB thumb, USB, Thunderbolt, or FireWire drive

DiskMaker X will require at least 8GB of capacity on whatever drive you select to be your bootable install drive. USB thumb drives are adequate for the task; this OWC 16.0GB Dual USB Flash Drive (see image above) is perfect, and it’s only $9.99. Likewise, a fast 500GB OWC Mercury On-The-Go Pro USB 3.0 drive ($94.99) is a lot speedier for installation, the same drive in a FireWire 800 version ($119.99) is handy with Macs that support that connection, and for the best possible speed while performing mass installations of macOS Sierra from the drive, you’ll want to look into something like this 1TB LaCie Rugged Thunderbolt drive ($179.99).

Note that whatever is on the drive when you create your bootable macOS Sierra Install Drive will be erased. If you plan to use the same drive to carry other utilities or tools, or to serve as a backup drive, you’ll need to do that after the bootable install drive is created.

Launch DiskMaker X 6

Make sure that your drive is attached to your Mac and visible from the Finder, then launch DiskMaker X 6. As you can see in the screenshot below, DiskMaker X 6 allows the creation of bootable disks for Mac OS X Yosemite, Mac OS X El Capitan, and of course macOS Sierra.

The main DiskMaker X 6 dialog

The main DiskMaker X 6 dialog

In this example, we’re making a macOS Sierra boot disk, so click the highlighted (blue) button. If the “Download the macOS Sierra installer” step was bypassed, DiskMaker X 6 responds with an error message and quits, so make sure that you have the installer on your Mac. When the installer is on your Mac, DiskMaker X 6 displays a dialog asking which copy of the installer you want to use:

DiskMaker finds the macOS Sierra installer

DiskMaker finds the macOS Sierra installer

The copy we are using is in the Applications folder, so click the highlighted (blue) button marked “Use this copy”. Next, DiskMaker X 6 asks for the type of disk you’ll be using for your bootable disk (see image below). Note that if you’re using a 8GB (or larger) USB thumb drive, it will be completely erased. DiskMaker will erase any complete volume that you signify, so if you wish to make a disk that can install Yosemite, El Capitan, and Sierra, consider using Disk Utility (found in the Applications/Utilities folder) to partition the drive into three separate volumes, one for each operating system version.

Which disk will you use? A thumb drive, or a connected HDD or SSD?

Which disk will you use? A thumb drive, or a connected HDD or SSD?

For this example, we’re using a small RAID device so clicking “Another kind of disk” is appropriate. As seen in the following screenshot, the drive “RAID1” was selected by clicking on its name, and then “Choose this disk” was clicked.

Select the disk volume for your boot disk, then click "Choose this disk"

Select the disk volume for your boot disk, then click “Choose this disk”

This is your last chance to make sure that you really want to erase the disk and turn it into a bootable drive. When you’re sure, click the “Erase then create the disk” button (see below):

One last chance to cancel the erasure of the target boot drive

One last chance to cancel the erasure of the target boot drive

Once the blue button has been clicked, a lot happens very quickly. Since the Mac requires administrator privileges in order to make the new boot drive, you’ll be reminded that the admin user name and password will need to be entered (see below) and then a standard Mac login dialog appears.

A reminder that you'll need the admin username and password to create the boot disk

A reminder that you’ll need the admin username and password to create the boot disk

During the disk creation process temporary windows will open and close, files are copied, and a lion roars. When you hear the lion’s roar, you know that DiskMaker X 6 has completed the process and a dialog informs you of that fact. At this point, it’s possible to either reboot your Mac while holding down the Option (Alt) key to select the drive, or use System Preferences > Startup Disk to select it.

The bootable macOS Sierra disk is ready!

The bootable macOS Sierra disk is ready!

You can also quit and do the macOS Sierra upgrades at a later time, and/or make a donation towards the care and feeding of the DiskMaker X developers.  There is another way to make a bootable installation disk that requires familiarity with the Mac command line, but DiskMaker X just makes the process much more “Mac-like” and transparent.


LEAVE A COMMENT


  • This little helper app makes creating an installer disk a simple, foolproof procedure. Considering the damage that can be done using a faulty installer, DiskMaker X removes the uncertainty in what can already be a very laborious task (making a clean install and manually rebuilding a system). Anything that simplifies this procedure is well-worth using.




  • When I try select my Flash Drive (named ‘sierra’) to “Erase”, I get this message:

    “Erasing drive ‘/Volumes/sierra’…” doesn’t understand the <> message.

    Is there something that I am doing incorrectly?




  • I heard the lion’s roar, so, DiskMaker X 6 has completed the process and a dialog informs you of that fact. At this point, it’s possible to either reboot your Mac while holding down the Option (Alt) key to select the drive, the only selection I have is my original Macintosh HD and I have a drive left on my desktop. Yes, in Finder it will show macOS Sierra as one of the device’s. Please provide some direction in order to boot from the thumb drive. Thanks




    • I also couldn’t see the usb
      drive except in disc utility. Holding down alt did not work when restarting so I used command r and then used install Sierra from the options on the screen




  • What is the advantage of using DiskMaker X instead of just downloading the Apple Mac installer and install from it?

    On the other hand, these OWC web pages do not remember username or e-mail.




  • I used to create these bootable installers. However, last year I discovered that when installing macOS this way on a drive lacking a recovery partition, no recovery partition is created along the way.

    Unless this behavior has changed, I recommend instead creating a bootable recovery partition and copying the standalone macOS installer(s) to the same or another partition on the drive. I then run the installer from Terminal and manually restart the Mac when the installer completes its preparation.