Get help using our products.
If you are running OS X El Capitan (10.11) or earlier, choose “Create Boot Disk” from the “iPartition” or “iDefrag” menu and follow the instructions.
If this does not work, or you are running macOS Sierra (10.12) or later, please follow the instructions below:
Obtain a suitable boot device. A USB stick of 16GB or more in size is suitable, or you could use an external hard disk.
In the Mac App Store, on the right hand side of the “Featured” page, under “Quick Links”, you should see a link to the latest version of the macOS (at the top). Click it.
Click the Download button to download the macOS installer.
Run the installer.
Click “Continue”, then agree to the license agreement.
Choose your boot device from the list that appears, and click “Install”.
When prompted, restart from your boot device and complete the install.
We recommend that you change the desktop background on your new boot device to one that you wouldn’t normally use, so that you can easily tell you are booted from something other than your normal boot device.
Install iDefrag, iPartition, and/or any other utility software you want to use, on the new device.
We also recommend that you leave your Boot Disk setting in System Preferences set to your usual boot device, then start from the new boot device by restarting and holding the Option (⌥) key when you hear your Mac’s boot chime.
Posted by alastair at 2016-Dec-28 11:12:03 UTC. Last updated 2016-Dec-28 13:12:57 UTC.