It can also help in situations where the operating system is corrupted or installation from app store shows errors. To create a bootable macOS installation disk, you have to burn the DMG file to a USB drive as CD/DVD is not available for Mac computers. Here's how to do it from text commands and using a purpose-built software called WizDMG. Mac App Store: Click a Button to Install an App. We’re all used to app stores on our phones, but on the desktop they remain an oddity. Still, the Mac App Store is a decent first place to check. Open the store, search for the app you want, and click “Get” then “Download.”. Ram Disk Creator 1.0.1 for Mac is available as a free download on our software library. This application's bundle is identified as com.donelleschi.ramdiskcreator. The latest installer occupies 504 KB on disk. The common filename for the application's installer is ramdiskcreator.dmg. Our antivirus analysis shows that this Mac download is malware.

Mac Backup Guru Backup with space saving tech. Flagship product. File Extractor Extract the files that are within files (Free) Style App Like Prisma on your Mac or PC (Free) Install Disk Creator Make a bootable macOS install disk (Free) Snoop Catcher Snapshots with your webcam on wake (Free) Duplicate Copy and paste anything, even a bootable disk. There’s another app called Diskmaker X, but the instructions below are for Install Disk Creator. Download Install Disk Creator by clicking on the link above. When the download is done, you can.

The idea behind a macOS Clean Install

When you install a new major version of OS X, or after some time has passed, it is a good idea to do a clean install (that is, to erase the disk you are installing OS X onto as part of the installation process).

That will make your Mac run blazingly fast for a few months or more, and many people report that it fixes longstanding problems they’ve had too.

It used to be common practice to occasionally run a clean install, and then manually migrate all the files and settings over in order to get a completely fresh start. However, it has been shown in recent times that in the vast majority of cases if you simply run a clean install, then duplicate your old home folder to your new disk, you will get all of the same advantages as a clean install followed by manual migration, with a small fraction of the effort.

Mac Clean Install Procedure

Here is the clean install procedure which can be performed at least every time a new version of macOS is released:

  1. Download the macOS installer from the App Store. You can download macOS High Sierra by clicking here.
  2. Backup all the data to an external disk with a clone. Two options are to use Duplicate (a free utility which can copy and paste an entire bootable volume), or Mac Backup Guru (a paid, fully featured backup utility with unique incremental backups capability) for that.
  3. Create a bootable USB Installer with Install Disk Creator and boot from it. Erase the startup disk and install macOS onto it. Boot up from this newly created startup disk.
  4. Note: The Finder’s built-in “Copy” and “Paste” will not work for the following.
    Go to the backup disk and use Duplicate (free) or Mac Backup Guru to right-click and select Copy on the home folder (eg: External Backup/Users/Bob) and then Paste on the Macintosh HD/Users folder on the startup disk. This migrates all of your personal data and settings to your new home folder.
    Then migrate the applications by selecting Copy on the External Backup/Applications folder on the backup disk then Paste on the startup disk (eg: Macintosh HD). This will copy all of the applications which are present on the backup disk but not present on the startup disk to your new Applications folder, and automatically skip any applications which are already on the startup disk.

At this point, after a reboot and some minor adjustments (the Dock may not have your previous configuration for example, if you did this while logged into the same user account as you just updated), your new OS should be indistinguishable from your previous one, while being faster and smaller due to reduced clutter.

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Data loss? Impossible with Get Backup Pro on Mac.

There are times when having a bootable USB drive for Mac is important. There is also an argument to be made to have an Apple backup available at all times. Here, we’ll walk you though why you may want to do so, and how to backup Mac.

Install Startup Disk Creator

A backup plan for all times

Get Setapp for all the tools you need to backup data and handle bootable drives for seamless security on Mac.

What is a Bootable USB or External Drive?

Simply stated, a bootable USB Mac drive is one that has a version (or versions) of macOS available on a disk that isn’t your machine. Whether it’s an external hard drive or a USB ‘thumb’ drive, both are considered bootable drives.

For the sake of clarity, we’ll simply refer to any external drive as a USB drive.

Before you begin, you’ll need to download the macOS version you’d like to use directly from Apple. It will download directly to your Applications folder; if your Mac starts to try to download and install the version of macOS you downloaded, simply quit the installation process.

How to Backup Mac to External Hard Drive

Curious how to create a bootable external drive for Mac? We’ve got you covered. First, you’ll need a USB drive, preferably one that is formatted to macOS Extended for any macOS backup to serve as your startup disk creator. Once you’ve done that, connect the USB drive to your machine, open the Terminal application on your Mac. Depending on the version of macOS you downloaded, enter one of the following commands:

  • Big Sur beta: sudo /Applications/Install macOS Big Sur --volume /Volumes/MyVolume
  • Catalina: sudo /Applications/Install macOS --volume /Volumes/MyVolume
  • Mojave: sudo /Applications/Install macOS --volume /Volumes/MyVolume
  • High Sierra: sudo /Applications/Install macOS High --volume /Volumes/MyVolume
  • Sierra: sudo /Applications/Install macOS --volume /Volumes/MyVolume --applicationpath /Applications/Install macOS
  • El Capitan: sudo /Applications/Install OS X El --volume /Volumes/MyVolume --applicationpath /Applications/Install OS X El
Note: If your USB drive has a unique name, replace ‘MyVolume’ in the command with the name of your USB drive. If you read the command, you’ll see your Mac is taking the version of macOS you downloaded from your Applications folder and placing it on your USB drive.

After entering the command, do the following:

  • Press ‘Return’ or ‘Enter’ on your keyboard
  • When prompted in Terminal, enter your administrator’s password
  • Press ‘Return’ or ‘Enter’ on your keyboard
  • When prompted in Terminal, type ‘y’ to confirm you’d like to erase the USB drive.

When finished, Terminal will show the volume has the same name as the installer you downloaded. You can now quit terminal and eject your USB Drive.

How to Boot Your Mac from a USB Drive

Now that you’ve created a bootable installer for your Mac, you can use it to boot a Mac using a fresh install of macOS! Here’s how:

  • Plug the bootable USB drive into your Mac
  • Open Startup Manager (or Startup Disk)
  • Select your USB drive from the list
  • Press ‘Restart’

Your mac will now start up in recovery mode, using the version of macOS you downloaded. From here, it may ask you to choose your language, set up a WiFi network, and other startup functions. When prompted, select ‘Install macOS’ from the Utilities window, then click ‘Continue’ and follow any on-screen directions. This is how you install macOS from a USB.

Don’t Forget to Backup Your Files!

Before starting the process, be sure to back your files and folders up! You can do this manually by digging through your files and loading them onto a separate USB drive, but there’s a better way.

Get rid of duplicates and junk

Disk Creator App

CleanMyMac X takes care of it in one scan. Use the app to free up disk space before running any installations.

CleanMyMacX is an app that helps optimize your Mac for performance, and also gets rid of duplicate files. We highly suggest running this prior to any installation of macOS from a bootable USB drive.

Backups are best accomplished using Disk Drill, which both backs up your files and folders (as well as applications) and saves them to an external source. It even checks for lost files so nothing goes missing accidentally.

One of the best backup and cloning apps is Get Backup Pro. It creates backups of your hard drive, complete with files and folders, and saves them to an external USB drive. It’s a lot like Apple’s Time Machine, but allows much better control, and has a better user interface.

Get Backup Pro also compresses your backups, allows for scheduling of automatic backups, and allows you to recover from an external drive onto any computer.


Having a USB drive with a ‘clean’ version of macOS is always a good idea. When things go amiss, it’s nice to have an easy way to start from scratch.

But this doesn’t transfer files, which is why we select Disk Drill and/or Get Backup Pro. Utilizing one (or both) will help your files stay somewhere safe, so you never have to worry. We also advocate for using CleanMyMacX before any backup, which helps ensure your system – and backups – are optimized.

Mac Install Disk Creator App Download

Luckily, all three are available as part of a free seven-day trial of Setapp, along with dozens of other great apps for Mac. Give it a shot!

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Meantime, prepare for all the awesome things you can do with Setapp.

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