the itjerk

my adventures with technology

el capitan, thank you

Don’t know if it’s just me or not, but doing a clean install on an old Mac computer has been a pain, since 10.6 Snow Leopard. Back in the early days of Mac OS X, you could boot a Mac into firewire mode and copy an image over. As Apple moved away from firewire, that became more and more difficult. Doing a clean install of an operating system became even more problematic after the switch to Intel processors, as Apple made version-specific demands on installers; this disc only worked with this machine, etc. Of course a few years ago, Apple did away with optical drives all together.

Fortunately, that’s changed, and now making a bootable flash drive is easy business. To perform a clean install of 10.11 El Capitan, go to the App Store and download the free installer, it’s about >6GB and will end up in your /Applications directory. Take a big enough USB drive, format it to “Mac OS Extended (Journaled)” and name it “Untitled”. Providing you keep these defaults the same, you just need to run this simple command to make your very own bootable installer:

sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app --nointeraction

Boot the Mac by holding down the option (Apple) key and you’ll be able to choose the USB drive as your startup device and proceed with a clean install.

Now that Apple is giving away free upgrades to their OS X, there’s really no reason to not run the latest and greatest version of OS X. (Well, maybe*). El Capitan will run on most any Mac that’s got a 64 bit processor, and you’ll have to go back a decade or so to find one that doesn’t have one – like my little Mac Mini with its core solo* that keeps chugging along after all these years!

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