Now to install the beta or alternative version of the Mac operating system on your external drive. Open a finder window, go to Applications and find the Catalina of Big Sur beta installer (or.

  • Global Nav Open Menu Global Nav Close Menu; Apple; Shopping Bag +.
  • The 5.8.8.8 version of Mac Free USB Flash Drive Recovery is available as a free download on our software library. The application lies within System Tools, more precisely Backup & Restore. This Mac download was scanned by our built-in antivirus and was rated as clean. The latest installation package takes up 7.7 MB on disk.

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.

Download macOS

Find the appropriate download link in the upgrade instructions for each macOS version:

macOS Catalina, macOS Mojave, ormacOS High Sierra
Installers for each of these macOS versions download directly to your Applications folder as an app named Install macOS Catalina, Install macOS Mojave, or Install macOS High Sierra. If the installer opens after downloading, quit it without continuing installation. Important: 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.

OS X El Capitan
El Capitan downloads as a disk image. 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. Make sure that it has at least 12GB of available storage and is formatted as Mac OS Extended.
  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 still 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.
    Catalina:*
    Mojave:*

    High Sierra:*
    El Capitan:
  4. Press Return after typing the command.
  5. When prompted, type your administrator password and press Return again. Terminal doesn't show any characters as you type your password.
  6. When prompted, type Y to confirm that you want to erase the volume, then press Return. Terminal shows the progress as the bootable installer is created.
  7. When Terminal says that it's done, the volume will have the same name as the installer you downloaded, such as Install macOS Catalina. You can now quit Terminal and eject the volume.

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

Use the bootable installer

After creating the bootable installer, follow these steps to use it:

  1. Plug the bootable installer into a compatible Mac.
  2. Use Startup Manager or Startup Disk preferences to select the bootable installer as the startup disk, then start up from it. Your Mac will start up to macOS Recovery.
    Learn about selecting a startup disk, including what to do if your Mac doesn't start up from it.
  3. Choose your language, if prompted.
  4. A bootable installer doesn't download macOS from the Internet, but it does require the Internet to get information specific to your Mac model, such as firmware updates. If you need to connect to a Wi-Fi network, use the Wi-Fi menu in the menu bar.
  5. Select Install macOS (or Install OS X) from the Utilities window, then click Continue and follow the onscreen instructions.

Learn more

Mac Operating System Upgrade

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

Catalina:

Mojave:

High Sierra:

El Capitan:

Apple Mac OS X Lion is now available to general public. The Mac OS X 10.7 Lion is available for installation only from the Mac App Store. This guide will teach you how to create a bootable USB Flash drive of Mac OS X Lion 10.7 and install Lion from USB, rather than downloading it from Mac App Store on each and every Mac computer you own.

Despite of numerous great and awesome features, Mac OSX Lion 10.7 has a big flaw that it is not available in bootable USB or DVD right now. Every time you you want to install OSX Lion on a Mac you will need to download it from Mac App Store all over again. Thanks to the bootable USB method which eliminates the downloading of Mac OS X Lion for each and every device and lets you install Mac OS X Lion on any Mac.

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Note: An official bootable USB of Mac OSX ion 10.7 will be available in August 2011 for $69. This method not only eliminates the wait for the official, it also saves you $40 (Mac App Store version costs $29).

Creating a bootable Mac OS X Lion 10.7 USB Flash drives requires medium level Mac knowledge, however, by following these simple instructions even a beginner should be able to install Mac OS X Lion via USB Flash Drive.

Why make a bootable Lion USB drive?

  • You can perform a clean OS X Lion installation with the bootable USB drive
  • The bootable Lion USB drive becomes a recovery disk with Disk Utility access, access to Time Machine backups, re-installation, and all other Recovery HD partition features
  • You will have external media to recover and reinstall Lion in the event of total drive failure or some other catastrophe

Required Stuff

  • Purchase and Download Mac OS X Lion from the App Store
  • 4GB USB Flash drive (8GB recommended)

If you have arranged the above mentioned items, simply follow the detailed guide below to create a bootable Mac OS X Lion 10.7 USB Flash Drive…

Step 1 – Locate the Lion InstallESD.dmg file

Once the Lion downloading is complete, go to the Applications folder and find the Install Mac OS X Lion.app file you just downloaded;
Right click on the Install Mac OS X Lion.app file and select Show Package Contents;


Now go to Contents > SharedSupport directory. Locate the file named: InstallESD.dmg and copy it on your desktop.

Step 2 – Format The USB

  1. Before formatting, If you have any data on your USB drive then save it;
  2. Plug the USB flash drive into your Mac;
  3. Launch Disk Utility from Applications;
  4. Select the plugged USB from the Left pane on the Disk Utility and click on Partition tab;
  5. Select 1 Partition from the Volume Scheme dropdown menu;
  6. Input a name for the USB and Choose Mac OS Extended (Journaled);
  7. Now click on Options button at the bottom. Select GUID Partition Table and click OK. Now click on Apply at the bottom right to start formatting.
Download Mac Operating System To Flash Drive

Step 3 – Make Mac OS X Lion Bootable USB

  1. Double-click on InstallESD.dmg (that you copied onto your Mac desktop) to mount the Lion disk image (mounted InstallESD.dmg should appear on Disk Utility application and desktop);
  2. Select the plugged USB from the Left pane on the Disk Utility and then go to Restore tab;
  3. Click and drag the IMac OS X Install ESD from the left pane and drop it in the Source field;
  4. Then Click and Drag the USB drive from the left pane and drop it in the Destination field;
  5. Make sure you have chosen the right USB drive, you don’t want to format the wrong drive and then click on Restore button;
  6. This will restore the Lion 10.7 image to the USB Flash drive. Wait for the process to complete.

Download Mac Operating System Free

Step 4 – Boot Mac OS X Lion from USB

  1. Reboot your Mac with the USB drive plugged in.
  2. Hold down the alt/Option key on your keyboard when you hear the OS X start-up sound.
  3. Choose the USB Flash Drive from there to boot.
  4. Now follow the on screen instructions to install OS X Lion.

You can follow the Step 4 to install Lion on other Macs with the bootable USB you just created.

[via Lifehacker]

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