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#CREAT BOOTABLE HIGH SIERRA USB MAC OS X#
#CREAT BOOTABLE HIGH SIERRA USB MAC OS#
#CREAT BOOTABLE HIGH SIERRA USB PRO#
#CREAT BOOTABLE HIGH SIERRA USB CODE#
#CREAT BOOTABLE HIGH SIERRA USB DOWNLOAD#

Apple seem to assume everybody has a spare MacBook from which to create a bootable USB so they provide absolutely no documentation to help with this. I use Linux Mint on my main laptop and that was all I had available. I then turned to attempting to make a bootable USB stick of OS X El Capitan from an image downloaded from Apple. I also tried Internet Recovery (Command+Option+R) but that gave exactly the same error (and would also only have installed OS X Mountain Lion).

#CREAT BOOTABLE HIGH SIERRA USB DOWNLOAD#

The detailed error log says “Chunk validation failed, retrying” about 1000 times and eventually gives up altogether.įurther investigation suggests this may be something to do with security certificates having expired and hence the machine not being able to download the necessary files from Apple’s servers, but it seems the error can appear for all sorts of reasons.

#CREAT BOOTABLE HIGH SIERRA USB MAC OS#

After about 30 seconds, a window pops up saying “ Can’t download the additional components needed to install Mac OS X” and the installation gives up. I tried that with this machine, and upon hitting “Reinstall MacOS X” was greeted with a prompt telling me it would take -2,148,456,222 days and 8 hours (an uncaught buffer overflow, me thinks). Having recently fixed a busted MacBook Air I had learned a bit about Recovery Mode (hold Command+R whilst pushing the Power button and release a few seconds after the machine wakes up). Since there wasn’t much worth saving I wiped it and initiated recovery mode in order to re-install OS X (El Capitan).

#CREAT BOOTABLE HIGH SIERRA USB PRO#

I was recently given a 2011 MacBook Pro that had been “well-loved” and was therefore a mess of missing applications, ghost files and generally slow-as-hell.

#CREAT BOOTABLE HIGH SIERRA USB MAC OS X#

If you want to start over and wipe out the data, you need to go into Disk Utility to reformat the internal drive first, and then install macOS Sierra.How to make a bootable USB drive on Linux Mint (19.3) to allow you to install Mac OS X El Capitan on a MacBook with broken or corrupted recovery mode. If you want to install Sierra and leave the data intact, select Install OS X.

Your Mac will display an OS X Utilites window.

(You don’t need to select a network to proceed.) Click on the external drive and hit Return.

After a few moments, your Mac should display the Startup Manager, which will show you the available boot drives.

Press down on the Option key while the Mac boots.

Plug your external drive into your Mac.

You can quit Terminal and your drive is ready for use. You should see Terminal display a “Copy complete” and Done notice.

Terminal will copy the installer file to your drive.

When that part is done, your Mac may ask you if you want to use the drive for Time Machine.

You’ll see that Terminal erases your drive.

To confirm that you want to continue, type Y and hit Return.

Terminal will tell you that it will erase your drive.

Terminal doesn’t display characters when you type it in.

#CREAT BOOTABLE HIGH SIERRA USB CODE#

Go back to Terminal and paste the copied code at the prompt.

Sudo /Applications/Install macOS Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/Untitled -applicationpath /Applications/Install macOS Sierra.app

Launch Terminal (/Applications/Utilities/Terminal.app).

If your drive is named something else, you need to change Untitled to the name of your drive.) (In the Terminal command you will use, I use Untitled to represent your external drive.

Connect the external drive to your Mac.

If your really don’t want to use Terminal, there are a couple of free apps you can use. The process detailed below involves the Terminal. Change the name of your drive to Untitled you need to do this for the steps below. The drive will be reformatted automatically as part of the process. I’ve used different drives with success, including a VisionTek 120GB USB 3.0 Pocket Solid State Drive ($83 on Amazon) and an old 8GB Iomega Micro Mini Hard Drive.ĭon’t worry if the drive isn’t formatted for the Mac. You can use a USB flash drive or a hard drive with room for the installer software. If it automatically launches after download, quit the installer. Look for macOS Sierra in the list of apps that you’ve bought, and click on the Download button.

You can download it again if you go to Purchased in the App Store. If you’ve already upgraded your Mac to Sierra, the installer is removed from the Applications folder. Keep the installer in the Applications folder.