A macOS USB installer saves much time when you want to install the OS offline on two or more Macs. Also, it helps in recovering a system after a startup failure. It is easy to make a macOS USB disk from the full installer downloaded from the App store; Apple provides clear-cut instructions for the same. However, people use this feature only when they have a problem with their computer, mainly when their system is not booting up. In this post, we explore the ways to make a bootable macOS USB for Catalina 10.15 and others from Windows PC and Mac.

1. Make Bootable Usb Dmg Using Windows
2. Make Bootable Dmg In Windows
3. Make Bootable Usb From Dmg

Make Bootable Usb Dmg Using Windows

Make macOS Catalina 10.15 USB installer on Windows PC

TimeMachine is the safest option to recover a broken Mac in the offline mode. If a backup is not there, you have to go for a clean installation either from a bootable USB/DVD drive or the Internet. In my case, I lost the boot partition of my iMac and didn’t have a TimeMachine backup. Internet recovery was showing up, but it kept on failing to download the OS files from the servers. As it is my only Mac, I had no option left, until I found the method to use a Windows PC to create a Mac OS bootable USB installer. I did this for making a macOS High Sierra USB drive, and later I was successful in reinstating my iMac. As of now, the OS is Mojave, but the process given below is compatible with all editions of macOS including the upcoming macOS Catalina 10.15.

Step 1: Download macOS Catalina [DMG] for Windows

As said in the beginning, a Mac is must for creating bootable macOS USB disk. If you think about doing it from Windows, the options are limited. The cross-compatibility of extensions for the two OS are entirely different. Luckily some Windows applications support a bootable macOS disk format, DMG. Hence, If we can download macOS DMG file, then it possible build the USB installer from Windows environment.

Most of the sites talking about the bootable macOS USB installer on Windows is not guiding on how to download the required DMG files for the method. Check our page to download macOS Catalina installer installer in DMG format for Catalina, Mojave and High Sierra.

Step 2: Partition USB disk on Windows to make it bootable on Mac

TransMac - Make DMG File Bootable USB on Windows. This is a fairly robust application for creating bootable USB on Windows from a DMG file. However, there's a preparatory step to be executed before you can create the bootable USB drive. I've tried many tutorials on how to create a mac bootable USB drive from Windows but none of them worked. So, I've come up with my own solution that worked fine with any DMG I've tested. Please find the details on my github page. Create macOS High Sierra Bootable USB Installer on Windows 10. First off, you need to prepare a bootable MacOS image and TransMac. Check out the download links below: +, Download Mojave, High Sierra, Sierra, El Capitan, Yosemite, Mavericks, Mountain Lion, Lion, Snow Leopard, Leopard and Tiger - bootable images (.ISO or DMG) from this topic: Download all MacOS X 10.4 - 10.14 original +, TransMac: Download. Aug 17, 2011  Is there a way i can take my snow leopard user DVD, and make a bootable USB out of it on Windows. My friends mac doesnt have a DVD drive. I already was able to rip it into a DMG file. So how can i take that and make it a bootable USB? Jun 09, 2017  UNetbootin - Method 2. I will show you how you can use UNetbootin to create a bootable USB, it can be used no only for Mac but for Windows and Linux distributions too. UNetbootin is free software and it is also available for Windows and Linux. Check the path name of your USB Disk. Always in Disk Utility, select the new partition that we created in the previous step, and click on the.

Here we are creating a UBS installer for Mac on Windows. So make sure that we keep the partition of the USB disk to have an appropriate scheme. Converting the USB disk to have a GUID partition table (GTP) is recommended for this method work effectively.

Connect the USB disk to Windows and run the above-given commands in the correct order. It cleans and converts the USB disk to GUID partition table if it is using MBR or something else.

Step 3: Make bootable macOS Catalina USB installer on Windows 10

When the Internet recovery is stuck and fails to download the OS files, you could use Windows to make a bootable macOS USB installer. Out of the two or three software for handling macOS installer [dmg] in Windows, Transmac is the best one. Transmac is not free, but the developers offer a 15-day trial period, and that is sufficient for one-time use. Now let’s move on to the steps to create macOS Catalina USB disk on Windows.

1. I already have the macOS Catalina 10.15 dmg file on my Windows desktop.
2. Install the Transmac 12.4 trial for Windows; download here.
3. Right-click on Transmac icon, and select to run it with Admin privileges.
4. As shown in the screenshot, right-click on your USB disk and pick the option Restore with Disk Image.
5. Point the Windows Explorer to the location where you have the bootable macOS DMG file.
6. Wait until the software completes restoring the USB disk with Install macOS Catalina app.
7. The disk is ready when you see the message “Restore Complete”.
8. If you click on the just-made USB installer on Transmac, you could see the macOS Catalina 10.15 files present in the drive.
9. Now safely remove the USB and connect it it the Mac you would like to recover.

Here we focus on preparing macOS Catalina 10.5 USB installer on Windows. But this method is same and applicable for Mojave, High Sierra and all previous versions up-to OS X Lion.

How to boot to macOS Catalina from USB Installer made on Windows

Make Bootable Dmg In Windows

Check the image below for macOS Catalina USB installer showing up in the boot options. In this way you could recover and restore a Mac without Internet. Some models of Macs show a prohibitory symbol when you boot from macOS Catalina recovery USB made on Windows. In that case, you need to Install Mojave or High Sierra first and then upgrade to Catalina 10.15 using the in-built software updater.

While restarting, Press the Option key on your Magic keyboard or MacBook see the boot choices. However, if you use a Windows keyboard for Mac, press the Alt key. When you see the boot menu, click on Install macOS Catalina (10.15), and proceed to the recovery process.

Make Bootable Usb From Dmg

Alternative: Make a bootable Catalina USB installer on macOS

The recovery partition in a Mac helps in restoring it from TimeMachine or the Internet when there is a system failure. It keeps the essential apps like Disk Utility, which aids in re-installing a fresh copy of macOS. However, this partition gets deleted when you change your Macs hard disk to SSD or like. A bootable macOS USB installer comes helpful in such situations. It is also useful when you want to install macOS on a couple of offline systems without wasting bandwidth and time.

You need a macOS DMG files for making a USB recovery disk in Windows but that not the case when you have a Mac. The only thing is that you have a copy of the Install macOS app, the offline installer downloaded from the App Store. Check out the most reliable ways to macOS USB recovery disk for Catalina, Mojave and High Sierra.

Method 1: Using Terminal to make macOS Catalina USB disk

1. 1. Maintain a copy of macOS Catalina full installer in the Applications folder.
   2. Use Disk Utility to erase the target USB to have macOS Extended format and GUID partition scheme.
   3. Now, copy the command for macOS Catalina 10.15 from Apple website, here and paste it to the Terminal app.
   4. In the code lines, there is a string “WINYTIPS.” Change it with the name of your USB.
   5. Open the Terminal app in Mac and copy-paste the edited code.
   6. Press the ENTER key and provide Admin password.
   7. Wait for a minute for the system to copy macOS Catalina installer and boot files to the USB.

Method 2: Using a third-party app to make booatble macOS USB disk.

If you are not familiar in dealing with the Terminal app and command-line interface, consider a freeware macOS app to create the bootable macOS installer. Among the many applications out there, we prefer Diskmaker as it supports Catalina, Mojave, High Sierra, and all other macOS builds after Lion.

The latest version DiskMaker 9 compatible with macOS Catalina 10.15.

Also, you may consider an alternative, macOS Catalina Patcher by Collin, here. The best thing about the patcher app is that it can make bootable MacOS ISO, and USB disk by downloading Catalina from the Internet, which DiskMaker do not support.

Download and create macOS Catalina USB bootable disk

• Download the latest version of the app from dosdude’s portal and mount the dmg file on your Mac.
• Click continue until you see the window shown in the screenshot.
• Here you may select an existing copy or macOS Catalina or download one from the Internet.
• Click on “Browse for a Copy” If you already have macOS 10.15 in your Applications folder.

Now, select the installation method as “Create a Bootable Installer,” and then pick the target USB disk in the next screen. Your macOS USB installer will be ready in a few minutes.

ConsApp incompatibility: Certain apps don't work with Yosemite, including enterprise applications like Cisco VPN, Parallels, and VMWare Fusion, which will not operate properly until updated patches are released. Additionally, Spotlight makes search much more intuitive and effective. Mac os x 10.10 download free. If you own an iOS device that can upgrade to iOS 8, Handoff (aka Continuity) is a must-have feature. Make calls on your Mac, send SMSs to non-iPhone users, and finish documents and emails begun on your iPad from your desktop.Fluid and fast: In our tests, the overall OS experience was fast and functionally stable, with most apps launching quickly and acting responsively.

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