how to create a bootable usb for old mac

Dont Miss: 60 Cool New Features in iOS 10 Siri is definitely the most tempting feature in macOS Sierra, which is more powerful than its iOS equivalent.

Another great one is the ability to copypaste between your iOS 10 device and Mac.

You can also use Apple Pay in Safari, unlock your Mac with your Apple Watch, keep all your Macs desktops and documents in sync, and use all the cool new iMessage features that iOS 10 already sports, among other things.

Create A Bootable Usb For Old Install Flash Drive

If you have multiple computers that need the macOS Sierra upgrade, youll want to create a bootable install flash drive.

Create A Bootable Usb For Old Download For MacOS

The download for macOS Sierra is about 5 GB, and could take some time downloading on each computer individually.

So downloading it once and making a bootable USB stick is an easier, faster way to go.

If you do, it will auto-erase the file when your system gets back up and running, which means you wont have the file for your USB drive.

So, close out of the installation screen that pops up, if any.

There is a way to trick it into supporting it, but its way less confusing to just use another application, namely, Install Disk Creator.

When the popup appears, hit Open.

Its possible an 8 GB one will work, but Ive had issues with using 8 GB drives for more recent Mac installer files in the past.

The following process will totally wipe your USB flash drive, so make sure that you back up all of your important files before proceeding, if any.

When ready, select your flash drive in the drop-down menu in Install Disk Creator.

As mentioned, this will erase your flash drive and turn it into a bootable macOS Sierra drive.

So this is your last chance to stop and back up any important files on your flash drive before continuing.

When the bootable drive is ready, youll see a popup telling you so.

The whole process took about 6-7 minutes for me, so it shouldnt take very long for you, either.

Most devices are supported, but just in case, check out the basic list of Macs you can install Sierra on below (for features requirements, see here ).

Also, youll need OS X 10.75 or later, 2 GB of memory, and at least 8.8 GB of available storage to upgrade your computer.

With your bootable USB drive inserted in your computer, restart your Mac, then hold the Option (alt) key down on your keyboard until the Startup Manager appears.

Just select Install macOS from the list of options, then follow all of the on-screen prompts to start the installation process.

After that, all you have to do is wait for it to boot back up with your new Sierra operating system Repeat this final step for any other computers you want to install Sierra on.

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How To Create A Bootable Usb For Old Mac