![]() ![]() El Capitan: sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia -volume /Volumes/Installer -applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app.Sierra: sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/Installer -applicationpath /Applications/Install\ macOS\ Sierra.app.Here’s the complete command for a few recent releases: The command above is specifically for High Sierra (and a disk named “Installer.”) Previous versions of macOS will have slightly different names. Notice that the Utilities folder, offered by DiskMaker X, is not here. The process will take a while, but when it’s done you’ll have a bootable drive with the installer. First the disk will be deleted, then the entire installer will be copied to your disk. Yet “y”, then Enter, and the process will begin. You will be asked to confirm that you’re ready for the disk to be deleted: For macOS Sierra, this is /Applications/Install\ macOS\ High\ Sierra.app To provide the application with a path to the installer package.To provide the application with a path to the volume that will be overwritten.Obviously, change “High\ Sierra.app” to whatever version you’re installing. /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia is the location of the script.This means the command must start with sudo In case you’re curious, here’s how this breaks down: sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia -volume /Volumes/Installer -applicationpath /Applications/Install\ macOS\ High\ Sierra.app Note that the exact command will vary depending on which version of macOS you’re trying to install this one is specific to Sierra. Open the Terminal, which you can find in Applications > Utilities, and run the following command. Next, let’s find the installation script. Generally, the latest version supports only the latest version of macOS if you want to install something older than macOS High Sierra, check the list of older versions and download one that’s compatible with your chosen operating system. The simplest way to create a boot USB drive is to download DiskMaker X and use it to create your drive. There are two ways to do this: one with third party software, and another with the Terminal. Again, the installer will launch when the download is complete close the window when this happens. Click the “Download” button to the left of the release you want to install, and your Mac will download it. You will only find versions you’ve previously downloaded here. Instead, you’ll have to head to the “Purchases” tab in the installer and scroll down until you find the version of macOS you want on your thumb drive. If you don’t want the latest version of macOS, searching the App Store won’t help you. The installer will load when the process is done simply close the window, then head to your Applications folder to confirm the installer is there. I don't have a great deal of background knowledge regarding terminal, etc., but I'm can follow directions and catch on fairly quickly.The download will take a while, so make sure your Mac is plugged in and has a consistent connection to the Internet. I read somewhere that this is a problem caused by drive failure, but what are the odds of TWO of them dying within a week of each other, and T2 is only about six weeks old. ![]() Mdrks-macbook-pro:~ mdrk$ /sbin/fsck -b 40864 /dev/disk4s3 Mdrks-macbook-pro:~ mdrk$ /sbin/fsck -b 32 /dev/disk4s3 Here's what I get when I try an alternate superblock location, even though fsck indicated that these WERE alternate locations: When I run fsck, I am told that BOTH drives have invalid block count/wrong magic #. I do not have Disk Warrior - $99 is a big deal, especially if it might not work. Tech Tools Pro 5 doesn't even seem to try. T2 began having problems about a week or so ago, and disk utility (from the boot volume and when booted from the original dvd) couldn't fix it. T1 is my Time Machine volume, and both drives are bootable. I have two external hard drives, both Lacie branded 1tb drives named T1 and T2. ![]()
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