Trepa Mac OS

These advanced steps are primarily for system administrators and others who are familiar with the command line. You don't need a bootable installer to upgrade macOS or reinstall macOS, but it can be useful when you want to install on multiple computers without downloading the installer each time.

A library of over 125,000 free and free-to-try software applications for Mac OS. Today is the 20th anniversary of the launch of Mac OS X, and Macworld has an interesting piece on the history leading up to it. Jason Snell goes so far as to say that the new operating system for.

What you need to create a bootable installer

  • A USB flash drive or other secondary volume formatted as Mac OS Extended, with at least 14GB of available storage
  • A downloaded installer for macOS Big Sur, Catalina, Mojave, High Sierra, or El Capitan

Download macOS

  • Download: macOS Big Sur, macOS Catalina, macOS Mojave, or macOS High Sierra
    These download to your Applications folder as an app named Install macOS [version name]. If the installer opens after downloading, quit it without continuing installation. To get the correct installer, download from a Mac that is using macOS Sierra 10.12.5 or later, or El Capitan 10.11.6. Enterprise administrators, please download from Apple, not a locally hosted software-update server.
  • Download: OS X El Capitan
    This downloads as a disk image named InstallMacOSX.dmg. On a Mac that is compatible with El Capitan, open the disk image and run the installer within, named InstallMacOSX.pkg. It installs an app named Install OS X El Capitan into your Applications folder. You will create the bootable installer from this app, not from the disk image or .pkg installer.

Use the 'createinstallmedia' command in Terminal

  1. Connect the USB flash drive or other volume that you're using for the bootable installer.
  2. Open Terminal, which is in the Utilities folder of your Applications folder.
  3. Type or paste one of the following commands in Terminal. These assume that the installer is in your Applications folder, and MyVolume is the name of the USB flash drive or other volume you're using. If it has a different name, replace MyVolume in these commands with the name of your volume.
Trepa Mac OS

Big Sur:*

Catalina:*

Mojave:*

High Sierra:*

El Capitan:

* If your Mac is using macOS Sierra or earlier, include the --applicationpath argument and installer path, similar to the way this is done in the command for El Capitan.


After typing the command:

  1. Press Return to enter the command.
  2. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
  3. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the volume is erased.
  4. After the volume is erased, you may see an alert that Terminal would like to access files on a removable volume. Click OK to allow the copy to proceed.
  5. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Big Sur. You can now quit Terminal and eject the volume.

Use the bootable installer

Determine whether you're using a Mac with Apple silicon, then follow the appropriate steps:

Apple silicon

  1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
  2. Turn on your Mac and continue to hold the power button until you see the startup options window, which shows your bootable volumes.
  3. Select the volume containing the bootable installer, then click Continue.
  4. When the macOS installer opens, follow the onscreen instructions.

Intel processor

  1. Plug the bootable installer into a Mac that is connected to the internet and compatible with the version of macOS you're installing.
  2. Press and hold the Option (Alt) ⌥ key immediately after turning on or restarting your Mac.
  3. Release the Option key when you see a dark screen showing your bootable volumes.
  4. Select the volume containing the bootable installer. Then click the up arrow or press Return.
    If you can't start up from the bootable installer, make sure that the External Boot setting in Startup Security Utility is set to allow booting from external media.
  5. Choose your language, if prompted.
  6. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Learn more

A bootable installer doesn't download macOS from the internet, but it does require an internet connection to get firmware and other information specific to the Mac model.

For information about the createinstallmedia command and the arguments you can use with it, make sure that the macOS installer is in your Applications folder, then enter the appropriate path in Terminal:

It was two decades ago to the day—March 24, 2001—that Mac OS X first became available to users the world over. We're not always big on empty sentimentality here at Ars, but the milestone seemed worthy of a quick note.

Of course, Mac OS X (or macOS 10 as it was later known) didn't quite survive to its 20th birthday; last year's macOS Big Sur update brought the version number up to 11, ending the reign of X.

But despite its double life on x86 and ARM processors and its increasingly close ties to iOS and iPadOS, today's macOS is still very much a direct descendant of that original Mac OS X release. Mac OS X, in turn, evolved in part from Steve Jobs' NeXT operating system—which had recently been acquired by Apple—and its launch was the harbinger of the second Jobs era at Apple.

Cheetah, Mac OS X's initial release, was pretty buggy. But it introduced a number of things that are still present in the operating system today. Those included the dock, which—despite some refinements and added features—is still fundamentally the same now as it ever was, as well as the modern version of Finder. And while macOS has seen a number of UI and design tweaks that have changed over time, the footprints of Cheetah's much-hyped Aqua interface can still be found all over Big Sur.

Trepa Mac Os Sierra

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Trepa Mac Os X

OS X brought many new features and technologies we now take for granted, too. For example, it enabled Apple's laptops to wake up from sleep immediately, and it introduced dynamic memory management, among other things.

Mac OS X's greatest impact in retrospect may be in the role it had in inspiring and propping up iOS, which has far surpassed macOS as Apple's most widely used operating system. And indeed, macOS lives in a very different context today than it did in 2001. It was recently bumped from the No.2 operating system spot globally by Google's Chrome OS, ending a very long run for Mac OS as the world's second-most popular desktop operating system in terms of units shipped.

The most popular desktop operating system in 2021 is Windows, just as it was in 2001, but the most popular OS overall is Google's Android, which has dramatically larger market share in the mobile space than iOS does.

Trepa Mac Os Catalina

So while Mac OS X's influence is profound, it exists today primarily as a support for iOS, which is also itself not the most popular OS in its category. Despite Apple's resounding success in the second Steve Jobs era, as well as in the recent Tim Cook era, the Mac is still a relatively niche platform—beloved by some, but skipped by much of the mainstream.

Trepa Mac Os Download

After 20 years, a lot has changed, but a whole lot has stayed the same.